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If ever there has been an unsung genius, it is James Prinsep. Born in 1799, he had a short life of only forty years, dying in 1840. And yet, considering his wide variety of interests and his seminal contributions in many of these areas, it can, with some confidence, be stated that he was one of the greatest geniuses born in human history. Thus, he was at the same time a physicist, a chemist, an anthropologist, a geologist, a meteorologist, a numismatist, an epigraphist, a town-planner, a cartographer and an architect and one may not have exhausted the list. Actually, his one achievement, that of deciphering the Brahmi script, through which India and the world came to know of that unique figure in world history Emperor Ashoka would have entitled him to a place among the greats of intellectual history. And when one considers that James deciphered not one, but two ancient scripts Brahmi and Kharoshthi through which was revealed the existence of a whole line of Indo-Scythian kings, one stands in awe of the man. But among all these varied interests, it was Benares, which was his passion. He spent only ten years here, but in this short span, considering his work, one can say that no individual contributed more to this holy and ancient city than James Prinsep. For consider these: he was the first to determine its latitude and longitude, the first to carry out an authentic census; and the first to construct a bridge over the river Karmanasa, a feat which had defied engineers and architects for nearly a century. He was also the person to lay the underground drainage system one that still serves the city. As a family memoir says: to extend the catalogue to a detail of the roads, bridges, drains and other works of every variety of description (in Benares), which were put in hand and completed would fatigue the readera. Amidst all this hectic activity, one can almost picture him sitting on a winter afternoon on one of the ghats, with the river (which he fondly calls our Ganga) flowing quietly by, looking around and then conceiving of this magnificent work Benares Illustrated. As you turn these pages, you not only travel with him from ghat to ghat, but also participate though in a limited way, in the life of the city. One can only marvel at the three dimensional portrayal of the various sites and the play of light and shade in these marvellous sketches. With this edition, one hopes that James will also come to occupy a place among the great artists of his age. This volume is further enhanced by a write-up entitled James Prinsep and Benares by O.P.Kejariwal, Considered an authority on James Prinsep, his write-up is based on material which has not been available previously. The present volume also has nine Appendices comprising articles which Prinsep wrote while in Benares. Included among these is the Benares Directory reproduced here in full and which lists all the important families of Benares in Prinsep's time. Some of the present generation, in all probability, will be able to find their ancestors included in this Directory.
This fascinating book provides a stimulating introduction to analog electronics by analysing the design and construction of a radio transceiver. Essential theoretical background is given along with carefully designed laboratory and homework exercises. The author begins with a thorough description of basic electronic components and simple circuits and goes on to describe the key elements of radio electronics, including filters, amplifiers, oscillators, mixers, and antennas. Laboratory exercises lead the reader through the design, construction, and testing of a popular radio transceiver (the NorCal 40A). A diskette containing the widely known circuit simulation software, Puff, is included in the book. This was the first book to deal with elementary electronics in the context of radio. It can be used as a textbook for introductory analog electronics courses, for more advanced undergraduate classes on radio-frequency electronics, and will also be of great interest to electronics hobbyists and radio enthusiasts.
Discover (or rediscover) the fun and magic of building electronic circuits with thermatrons (vacuum tubes). This book has everything you need to know about the art and science of thermatron design and construction. It pulls together, in one easy to read book, thermatron types and characteristics, thermatron homebrew techniques, and how to design audio and RF triode and pentode circuits. The book is written primarily for radio amateurs (or audio equipment builders) that already understands basic electronics but have forgotten or never had the pleasure of working with hollow-state devices. The Second Edition includes over 50+ pages of new and revised material including a new chapter on thermatron oscillator design.
A manual for amateur radio enthusiasts discusses the history of packet radio, hardware systems, networking, setting up an amateur packet radio station, and equipment and accessories
In just 24 sessions of one hour or less, Sams Teach Yourself Arduino Programming in 24 Hours teaches you C programmingon Arduino, so you can start creating inspired "DIY" hardwareprojects of your own! Using this book's straightforward, step-by-stepapproach, you'll walk through everything from setting up yourprogramming environment to mastering C syntax and features, interfacing your Arduino to performing full-fledged prototyping.Every hands-on lesson and example builds on what you've alreadylearned, giving you a rock-solid foundation for real-world success! Step-by-step instructions carefully walk you through the most common Arduino programming tasks. Quizzes at the end of each chapter help you test your knowledge. By the Way notes present interesting information related to the discussion. Did You Know? tips offer advice or show you easier ways to perform tasks. Watch Out! cautions alert you to possible problems and give you advice on how to avoid them. Learn how to... Get the right Arduino hardware and accessories for your needs Download the Arduino IDE, install it, and link it to your Arduino Quickly create, compile, upload, and run your first Arduino program Master C syntax, decision control, strings, data structures, and functions Use pointers to work with memory--and avoid common mistakes Store data on your Arduino's EEPROM or an external SD card Use existing hardware libraries, or create your own Send output and read input from analog devices or digital interfaces Create and handle interrupts in software and hardware Communicate with devices via the SPI interface and I2C protocol Work with analog and digital sensors Write Arduino C programs that control motors Connect an LCD to your Arduino, and code the output Install an Ethernet shield, configure an Ethernet connection, and write networking programs Create prototyping environments, use prototyping shields, and interface electronics to your Arduino
Handy, complete, and easily accessible, this compact, perfect-for-any-project guide provides a compendium of the latest data encompassing aspects of electronics, definitions, facts, formulas, and more. This third edition contains new sections on communications, computing electronics and networking, and active filters.