Download or read book Engraved Landscape Biesje Poort written by Mary Elizabeth Lange and published by . This book was released on 2013 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Automatic Solar Tracking Sun Tracking Satellite Tracking rastreador solar seguimento solar seguidor solar autom tico de seguimiento solar written by Gerro Prinsloo and published by Gerro Prinsloo. This book was released on 2015-11-01 with total page 542 pages. Available in PDF, EPUB and Kindle. Book excerpt: Automatic Solar Tracking Sun Tracking : This book details Automatic Solar-Tracking, Sun-Tracking-Systems, Solar-Trackers and Sun Tracker Systems. An intelligent automatic solar tracker is a device that orients a payload toward the sun. Such programmable computer based solar tracking device includes principles of solar tracking, solar tracking systems, as well as microcontroller, microprocessor and/or PC based solar tracking control to orientate solar reflectors, solar lenses, photovoltaic panels or other optical configurations towards the sun. Motorized space frames and kinematic systems ensure motion dynamics and employ drive technology and gearing principles to steer optical configurations such as mangin, parabolic, conic, or cassegrain solar energy collectors to face the sun and follow the sun movement contour continuously (seguimiento solar y automatización, automatización seguidor solar, tracking solar e automação, automação seguidor solar, inseguimento solare, inseguitore solare, energia termica, sole seguito, posizionatore motorizzato) In harnessing power from the sun through a solar tracker or practical solar tracking system, renewable energy control automation systems require automatic solar tracking software and solar position algorithms to accomplish dynamic motion control with control automation architecture, circuit boards and hardware. On-axis sun tracking system such as the altitude-azimuth dual axis or multi-axis solar tracker systems use a sun tracking algorithm or ray tracing sensors or software to ensure the sun's passage through the sky is traced with high precision in automated solar tracker applications, right through summer solstice, solar equinox and winter solstice. A high precision sun position calculator or sun position algorithm is this an important step in the design and construction of an automatic solar tracking system. The content of the book is also applicable to communication antenna satellite tracking and moon tracking algorithm source code for which links to free download links are provided. From sun tracing software perspective, the sonnet Tracing The Sun has a literal meaning. Within the context of sun track and trace, this book explains that the sun's daily path across the sky is directed by relatively simple principles, and if grasped/understood, then it is relatively easy to trace the sun with sun following software. Sun position computer software for tracing the sun are available as open source code, sources that is listed in this book. The book also describes the use of satellite tracking software and mechanisms in solar tracking applications. Ironically there was even a system called sun chaser, said to have been a solar positioner system known for chasing the sun throughout the day. Using solar equations in an electronic circuit for automatic solar tracking is quite simple, even if you are a novice, but mathematical solar equations are over complicated by academic experts and professors in text-books, journal articles and internet websites. In terms of solar hobbies, scholars, students and Hobbyist's looking at solar tracking electronics or PC programs for solar tracking are usually overcome by the sheer volume of scientific material and internet resources, which leaves many developers in frustration when search for simple experimental solar tracking source-code for their on-axis sun-tracking systems. This booklet will simplify the search for the mystical sun tracking formulas for your sun tracker innovation and help you develop your own autonomous solar tracking controller. By directing the solar collector directly into the sun, a solar harvesting means or device can harness sunlight or thermal heat. This is achieved with the help of sun angle formulas, solar angle formulas or solar tracking procedures for the calculation of sun's position in the sky. Automatic sun tracking system software includes algorithms for solar altitude azimuth angle calculations required in following the sun across the sky. In using the longitude, latitude GPS coordinates of the solar tracker location, these sun tracking software tools supports precision solar tracking by determining the solar altitude-azimuth coordinates for the sun trajectory in altitude-azimuth tracking at the tracker location, using certain sun angle formulas in sun vector calculations. Instead of follow the sun software, a sun tracking sensor such as a sun sensor or webcam or video camera with vision based sun following image processing software can also be used to determine the position of the sun optically. Such optical feedback devices are often used in solar panel tracking systems and dish tracking systems. Dynamic sun tracing is also used in solar surveying, DNI analyser and sun surveying systems that build solar infographics maps with solar radiance, irradiance and DNI models for GIS (geographical information system). In this way geospatial methods on solar/environment interaction makes use use of geospatial technologies (GIS, Remote Sensing, and Cartography). Climatic data and weather station or weather center data, as well as queries from sky servers and solar resource database systems (i.e. on DB2, Sybase, Oracle, SQL, MySQL) may also be associated with solar GIS maps. In such solar resource modelling systems, a pyranometer or solarimeter is normally used in addition to measure direct and indirect, scattered, dispersed, reflective radiation for a particular geographical location. Sunlight analysis is important in flash photography where photographic lighting are important for photographers. GIS systems are used by architects who add sun shadow applets to study architectural shading or sun shadow analysis, solar flux calculations, optical modelling or to perform weather modelling. Such systems often employ a computer operated telescope type mechanism with ray tracing program software as a solar navigator or sun tracer that determines the solar position and intensity. The purpose of this booklet is to assist developers to track and trace suitable source-code and solar tracking algorithms for their application, whether a hobbyist, scientist, technician or engineer. Many open-source sun following and tracking algorithms and source-code for solar tracking programs and modules are freely available to download on the internet today. Certain proprietary solar tracker kits and solar tracking controllers include a software development kit SDK for its application programming interface API attributes (Pebble). Widget libraries, widget toolkits, GUI toolkit and UX libraries with graphical control elements are also available to construct the graphical user interface (GUI) for your solar tracking or solar power monitoring program. The solar library used by solar position calculators, solar simulation software and solar contour calculators include machine program code for the solar hardware controller which are software programmed into Micro-controllers, Programmable Logic Controllers PLC, programmable gate arrays, Arduino processor or PIC processor. PC based solar tracking is also high in demand using C++, Visual Basic VB, as well as MS Windows, Linux and Apple Mac based operating systems for sun path tables on Matlab, Excel. Some books and internet webpages use other terms, such as: sun angle calculator, sun position calculator or solar angle calculator. As said, such software code calculate the solar azimuth angle, solar altitude angle, solar elevation angle or the solar Zenith angle (Zenith solar angle is simply referenced from vertical plane, the mirror of the elevation angle measured from the horizontal or ground plane level). Similar software code is also used in solar calculator apps or the solar power calculator apps for IOS and Android smartphone devices. Most of these smartphone solar mobile apps show the sun path and sun-angles for any location and date over a 24 hour period. Some smartphones include augmented reality features in which you can physically see and look at the solar path through your cell phone camera or mobile phone camera at your phone's specific GPS location. In the computer programming and digital signal processing (DSP) environment, (free/open source) program code are available for VB, .Net, Delphi, Python, C, C+, C++, PHP, Swift, ADM, F, Flash, Basic, QBasic, GBasic, KBasic, SIMPL language, Squirrel, Solaris, Assembly language on operating systems such as MS Windows, Apple Mac, DOS or Linux OS. Software algorithms predicting position of the sun in the sky are commonly available as graphical programming platforms such as Matlab (Mathworks), Simulink models, Java applets, TRNSYS simulations, Scada system apps, Labview module, Beckhoff TwinCAT (Visual Studio), Siemens SPA, mobile and iphone apps, Android or iOS tablet apps, and so forth. At the same time, PLC software code for a range of sun tracking automation technology can follow the profile of sun in sky for Siemens, HP, Panasonic, ABB, Allan Bradley, OMRON, SEW, Festo, Beckhoff, Rockwell, Schneider, Endress Hauser, Fudji electric. Honeywell, Fuchs, Yokonawa, or Muthibishi platforms. Sun path projection software are also available for a range of modular IPC embedded PC motherboards, Industrial PC, PLC (Programmable Logic Controller) and PAC (Programmable Automation Controller) such as the Siemens S7-1200 or Siemens Logo, Beckhoff IPC or CX series, OMRON PLC, Ercam PLC, AC500plc ABB, National Instruments NI PXI or NI cRIO, PIC processor, Intel 8051/8085, IBM (Cell, Power, Brain or Truenorth series), FPGA (Xilinx Altera Nios), Intel, Xeon, Atmel megaAVR, MPU, Maple, Teensy, MSP, XMOS, Xbee, ARM, Raspberry Pi, Eagle, Arduino or Arduino AtMega microcontroller, with servo motor, stepper motor, direct current DC pulse width modulation PWM (current driver) or alternating current AC SPS or IPC variable frequency drives VFD motor drives (also termed adjustable-frequency drive, variable-speed drive, AC drive, micro drive or inverter drive) for electrical, mechatronic, pneumatic, or hydraulic solar tracking actuators. The above motion control and robot control systems include analogue or digital interfacing ports on the processors to allow for tracker angle orientation feedback control through one or a combination of angle sensor or angle encoder, shaft encoder, precision encoder, optical encoder, magnetic encoder, direction encoder, rotational encoder, chip encoder, tilt sensor, inclination sensor, or pitch sensor. Note that the tracker's elevation or zenith axis angle may measured using an altitude angle-, declination angle-, inclination angle-, pitch angle-, or vertical angle-, zenith angle- sensor or inclinometer. Similarly the tracker's azimuth axis angle be measured with a azimuth angle-, horizontal angle-, or roll angle- sensor. Chip integrated accelerometer magnetometer gyroscope type angle sensors can also be used to calculate displacement. Other options include the use of thermal imaging systems such as a Fluke thermal imager, or robotic or vision based solar tracker systems that employ face tracking, head tracking, hand tracking, eye tracking and car tracking principles in solar tracking. With unattended decentralised rural, island, isolated, or autonomous off-grid power installations, remote control, monitoring, data acquisition, digital datalogging and online measurement and verification equipment becomes crucial. It assists the operator with supervisory control to monitor the efficiency of remote renewable energy resources and systems and provide valuable web-based feedback in terms of CO2 and clean development mechanism (CDM) reporting. A power quality analyser for diagnostics through internet, WiFi and cellular mobile links is most valuable in frontline troubleshooting and predictive maintenance, where quick diagnostic analysis is required to detect and prevent power quality issues. Solar tracker applications cover a wide spectrum of solar applications and solar assisted application, including concentrated solar power generation, solar desalination, solar water purification, solar steam generation, solar electricity generation, solar industrial process heat, solar thermal heat storage, solar food dryers, solar water pumping, hydrogen production from methane or producing hydrogen and oxygen from water (HHO) through electrolysis. Many patented or non-patented solar apparatus include tracking in solar apparatus for solar electric generator, solar desalinator, solar steam engine, solar ice maker, solar water purifier, solar cooling, solar refrigeration, USB solar charger, solar phone charging, portable solar charging tracker, solar coffee brewing, solar cooking or solar dying means. Your project may be the next breakthrough or patent, but your invention is held back by frustration in search for the sun tracker you require for your solar powered appliance, solar generator, solar tracker robot, solar freezer, solar cooker, solar drier, solar pump, solar freezer, or solar dryer project. Whether your solar electronic circuit diagram include a simplified solar controller design in a solar electricity project, solar power kit, solar hobby kit, solar steam generator, solar hot water system, solar ice maker, solar desalinator, hobbyist solar panels, hobby robot, or if you are developing professional or hobby electronics for a solar utility or micro scale solar powerplant for your own solar farm or solar farming, this publication may help accelerate the development of your solar tracking innovation. Lately, solar polygeneration, solar trigeneration (solar triple generation), and solar quad generation (adding delivery of steam, liquid/gaseous fuel, or capture food-grade CO$_2$) systems have need for automatic solar tracking. These systems are known for significant efficiency increases in energy yield as a result of the integration and re-use of waste or residual heat and are suitable for compact packaged micro solar powerplants that could be manufactured and transported in kit-form and operate on a plug-and play basis. Typical hybrid solar power systems include compact or packaged solar micro combined heat and power (CHP or mCHP) or solar micro combined, cooling, heating and power (CCHP, CHPC, mCCHP, or mCHPC) systems used in distributed power generation. These systems are often combined in concentrated solar CSP and CPV smart microgrid configurations for off-grid rural, island or isolated microgrid, minigrid and distributed power renewable energy systems. Solar tracking algorithms are also used in modelling of trigeneration systems using Matlab Simulink (Modelica or TRNSYS) platform as well as in automation and control of renewable energy systems through intelligent parsing, multi-objective, adaptive learning control and control optimization strategies. Solar tracking algorithms also find application in developing solar models for country or location specific solar studies, for example in terms of measuring or analysis of the fluctuations of the solar radiation (i.e. direct and diffuse radiation) in a particular area. Solar DNI, solar irradiance and atmospheric information and models can thus be integrated into a solar map, solar atlas or geographical information systems (GIS). Such models allows for defining local parameters for specific regions that may be valuable in terms of the evaluation of different solar in photovoltaic of CSP systems on simulation and synthesis platforms such as Matlab and Simulink or in linear or multi-objective optimization algorithm platforms such as COMPOSE, EnergyPLAN or DER-CAM. A dual-axis solar tracker and single-axis solar tracker may use a sun tracker program or sun tracker algorithm to position a solar dish, solar panel array, heliostat array, PV panel, solar antenna or infrared solar nantenna. A self-tracking solar concentrator performs automatic solar tracking by computing the solar vector. Solar position algorithms (TwinCAT, SPA, or PSA Algorithms) use an astronomical algorithm to calculate the position of the sun. It uses astronomical software algorithms and equations for solar tracking in the calculation of sun's position in the sky for each location on the earth at any time of day. Like an optical solar telescope, the solar position algorithm pin-points the solar reflector at the sun and locks onto the sun's position to track the sun across the sky as the sun progresses throughout the day. Optical sensors such as photodiodes, light-dependant-resistors (LDR) or photoresistors are used as optical accuracy feedback devices. Lately we also included a section in the book (with links to microprocessor code) on how the PixArt Wii infrared camera in the Wii remote or Wiimote may be used in infrared solar tracking applications. In order to harvest free energy from the sun, some automatic solar positioning systems use an optical means to direct the solar tracking device. These solar tracking strategies use optical tracking techniques, such as a sun sensor means, to direct sun rays onto a silicon or CMOS substrate to determine the X and Y coordinates of the sun's position. In a solar mems sun-sensor device, incident sunlight enters the sun sensor through a small pin-hole in a mask plate where light is exposed to a silicon substrate. In a web-camera or camera image processing sun tracking and sun following means, object tracking software performs multi object tracking or moving object tracking methods. In an solar object tracking technique, image processing software performs mathematical processing to box the outline of the apparent solar disc or sun blob within the captured image frame, while sun-localization is performed with an edge detection algorithm to determine the solar vector coordinates. An automated positioning system help maximize the yields of solar power plants through solar tracking control to harness sun's energy. In such renewable energy systems, the solar panel positioning system uses a sun tracking techniques and a solar angle calculator in positioning PV panels in photovoltaic systems and concentrated photovoltaic CPV systems. Automatic on-axis solar tracking in a PV solar tracking system can be dual-axis sun tracking or single-axis sun solar tracking. It is known that a motorized positioning system in a photovoltaic panel tracker increase energy yield and ensures increased power output, even in a single axis solar tracking configuration. Other applications such as robotic solar tracker or robotic solar tracking system uses robotica with artificial intelligence in the control optimization of energy yield in solar harvesting through a robotic tracking system. Automatic positioning systems in solar tracking designs are also used in other free energy generators, such as concentrated solar thermal power CSP and dish Stirling systems. The sun tracking device in a solar collector in a solar concentrator or solar collector Such a performs on-axis solar tracking, a dual axis solar tracker assists to harness energy from the sun through an optical solar collector, which can be a parabolic mirror, parabolic reflector, Fresnel lens or mirror array/matrix. A parabolic dish or reflector is dynamically steered using a transmission system or solar tracking slew drive mean. In steering the dish to face the sun, the power dish actuator and actuation means in a parabolic dish system optically focusses the sun's energy on the focal point of a parabolic dish or solar concentrating means. A Stirling engine, solar heat pipe, thermosyphin, solar phase change material PCM receiver, or a fibre optic sunlight receiver means is located at the focal point of the solar concentrator. The dish Stirling engine configuration is referred to as a dish Stirling system or Stirling power generation system. Hybrid solar power systems (used in combination with biogas, biofuel, petrol, ethanol, diesel, natural gas or PNG) use a combination of power sources to harness and store solar energy in a storage medium. Any multitude of energy sources can be combined through the use of controllers and the energy stored in batteries, phase change material, thermal heat storage, and in cogeneration form converted to the required power using thermodynamic cycles (organic Rankin, Brayton cycle, micro turbine, Stirling) with an inverter and charge controller.

Download or read book South African libraries written by and published by . This book was released on 1971 with total page 698 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Mousaion written by and published by . This book was released on 1989 with total page 594 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Society Without God written by Phil Zuckerman and published by NYU Press. This book was released on 2010-06-07 with total page 237 pages. Available in PDF, EPUB and Kindle. Book excerpt: Are lawyers, by their very nature, agents of the state, of capital, of institutions of power? Or are there ways in which they can work constructively or transformatively for the disempowered, the working class, the underprivileged? Lawyers in a Postmodern World explores how lawyers actively create the forms of power which they and others deploy. Through engaging case studies, the book examines how lawyers work within and for powerful institutions and provides suggestions--both general and practical--for ways in which the practice of law can be made to work with and for the powerless. Individuals chapters address such subjects as the contradictions of radical law practice; legal work in South Africa; the economics and politics of negotiating justice; feminist legal scholarship and women's gendered lives; the overlapping worlds of law, business, and politics; theories of legal practice; and how lawyers are constitutive of gender relations. Contributing to the book are Maureen Cain (University of West Indies), Yves Dezalay (Centre National de la Recherche Scientifique, France), Martha Fineman (Columbia University), Sue Lees (University of North London), Doreen McBarnet (Wolfson College, Oxford), Frank Munger (SUNY, Buffalo), Wilfried Scharf (University of Cape Town), Stuart Scheingold (University of Washington), David Sugarman (Lancaster University), and Sally Wheeler (University of Nottingham).

Download or read book Public Service Regulation written by and published by . This book was released on 1913 with total page 716 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Economics Dictionary written by W. F. J. Steenkamp and published by . This book was released on 1976 with total page 382 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Patriot Woordeboek Dictionary Afrikaans Engels Cape Dutch English written by and published by . This book was released on 1902 with total page 658 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book South African Journal of Library and Information Science written by and published by . This book was released on 1995 with total page 260 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Veld Management Priciples and Practices written by Frits Van Oudtshoorn and published by . This book was released on 2016-01-04 with total page 256 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Leonardo Pisano Fibonacci written by L. E. Sigler and published by Elsevier. This book was released on 2014-06-28 with total page 147 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Book of Squares by Fibonacci is a gem in the mathematical literature and one of the most important mathematical treatises written in the Middle Ages. It is a collection of theorems on indeterminate analysis and equations of second degree which yield, among other results, a solution to a problem proposed by Master John of Palermo to Leonardo at the Court of Frederick II. The book was dedicated and presented to the Emperor at Pisa in 1225. Dating back to the 13th century the book exhibits the early and continued fascination of men with our number system and the relationship among numbers with special properties such as prime numbers, squares, and odd numbers. The faithful translation into modern English and the commentary by the translator make this book accessible to professional mathematicians and amateurs who have always been intrigued by the lure of our number system.

Download or read book Vegetation of Southern Africa written by R. M. Cowling and published by Cambridge University Press. This book was released on 1997 with total page 656 pages. Available in PDF, EPUB and Kindle. Book excerpt: Comprehensive illustrated guide to plant science and ecology of southern African vegetation.

Download or read book The Bishop s Boys A Life of Wilbur and Orville Wright written by Tom D. Crouch and published by W. W. Norton & Company. This book was released on 2003-04-17 with total page 609 pages. Available in PDF, EPUB and Kindle. Book excerpt: The reissue of this definitive biography heralds the one-hundredth anniversary of the Wright brothers' first flight. Brilliant, self-trained engineers, the Wright brothers had a unique blend of native talent, character, and family experience that perfectly suited them to the task of invention but left them ill-prepared to face a world of skeptics, rivals, and officials. Using a treasure trove of Wright family correspondence and diaries, Tom Crouch skillfully weaves the story of the airplane's invention into the drama of a unique and unforgettable family. He shows us exactly how and why these two obscure bachelors from Dayton, Ohio, were able to succeed where so many better-trained, better-financed rivals had failed.

Download or read book Visions of a Flying Machine written by Peter L. Jakab and published by Smithsonian Institution. This book was released on 1997-04-17 with total page 289 pages. Available in PDF, EPUB and Kindle. Book excerpt: This acclaimed book on the Wright Brothers takes the reader straight to the heart of their remarkable achievement, focusing on the technology and offering a clear, concise chronicle of precisely what they accomplished and how they did it. This book deals with the process of the invention of the airplane and how the brothers identified and resolved a range of technical puzzles that others had attempted to solve for a century. Step by step, the book details the path of invention (including the important wind tunnel experiments of 1901) which culminated in the momentous flight at Kitty Hawk in 1903, the first major milestone in aviation history. Enhanced by original photos, designs, drawings, notebooks, letters and diaries of the Wright Brothers, Visions of a Flying Machine is a fascinating book that will be of interest to engineers, historians, enthusiasts, or anyone interested in the process of invention.

Download or read book The Opening of the Apartheid Mind written by Heribert Adam and published by Univ of California Press. This book was released on 2023-12-22 with total page 304 pages. Available in PDF, EPUB and Kindle. Book excerpt: Refusing to be governed by what is fashionable or inoffensive, Heribert Adam and Kogila Moodley frankly address the passions and rationalities that drive politics in post-apartheid South Africa. They argue that the country's quest for democracy is widely misunderstood and that public opinion abroad relies on stereotypes of violent tribalism and false colonial analogies. Adam and Moodley criticize the personality cult surrounding Nelson Mandela and the accolades accorded F. W. de Klerk. They reject the black-versus-white conflict and substitute sober analysis and strategic pragmatism for the moral outrage that typifies so much writing about South Africa. Believing that the best expression of solidarity emanates from sympathetic but candid criticism, they pose challenging questions for the African National Congress and Nelson Mandela. They give in-depth coverage to political violence, the ANC-South African Communist Party alliance, Inkatha, and other controversial topics as well. The authors do not propose a solution that will guarantee a genuinely democratic South Africa. What they offer is an understanding of the country's social conditions and political constraints, and they sketch options for both a new South Africa and a new post-Cold War foreign policy for the whole of southern Africa. The importance of this book is as immediate as today's headlines.

Download or read book South Africa in Contemporary Times written by Godfrey Mwakikagile and published by New Africa Press. This book was released on 2008 with total page 257 pages. Available in PDF, EPUB and Kindle. Book excerpt: This work looks at South Africa in contemporary times since the end of apartheid. It is also a short history of South Africa since the arrival of the first Dutch settlers at the Cape more than 300 years ago. The author also look at some of the main events in the struggle against apartheid which were important milestones in the transformation of South Africa from a white-dominated country to a multiracial democratic society. Other subjects covered include structural reforms and institutional accountability in the post-apartheid era and the problems of immigration, with South Africa being the main destination for immigrants from other African countries. The influx of immigrants from other parts of Africa into South Africa is a contentious subject within South Africa and has caused tensions between many South Africans and these immigrants. The author has addressed the subject from both perspectives, shedding some light on the strains and constraints Africans are bound to face when they deal with each other even in the context of Pan-African solidarity. The work is also an excellent introduction for students and others including those who are going to South Africa for the first time. It can also be used as a supplementary text in college in the study of post-apartheid South Africa under the new dispensation and how the country is coping with some of the main challenges it faces in the 21st century, not only as a nation but also as the continent's most developed and most powerful country destined to inflluence the course of events across Africa for many years to come.

Download or read book Farthest North written by Fridtjof Nansen and published by . This book was released on 1898 with total page 806 pages. Available in PDF, EPUB and Kindle. Book excerpt: In September of 1893, Norwegian zoologist Fridtjof Nansen and a crew manned the schooner Fram, intending to drift, frozen in the Arctic pack-ice, to the North Pole. When it became clear that they would miss the pole, Nansen and his companion Hjalmar Johansen struck off by themselves. Racing the shrinking pack-ice, they attempted, by dog-sled, to go "farthest north." They survived a winter in a moss hut eating walruses and polar bears, and the public assumed they were dead. In the spring of 1896, after three years of trekking, and having made it to within four degrees of the pole, they returned to safety. Nansen's narrative stands with the best writing on polar exploration.