Page 493 | Volume 2 | Chapter 27 | Testing and Testing Apparatus
Ques. How is it known whether too much or too little resistance be unplugged?
Ans. The galvanometer needle will be deflected to one side for too much resistance, and to the opposite side for too little resistance.
Ques. What is the meaning of "Inf.," marked on the bridge?
Ans. It stands for "infinity," because the resistance coil at the point marked infinity is omitted so that adjacent sections of the arm are disconnected when the plug is taken out.
When first published in 1914, these books were intended to explain the scientific principles of electricity (which at the time was a new and exciting technology) with "the aid of a very large number of illustrations, together with specific explanations, worded in concise and simple language".
What really makes this collection of books special today is the detailed documentation of most of the earliest inventions in electrical history including telegraphs, motors, switchboards, and high power distribution systems.
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Unfortunately, priceless material like this usually finds itself in the lost history of America. The mission of this project is to preserve that history and provide a simple yet powerful, direct means to each volume in digital form in which anyone can access while keeping as true to the original format as possible.
The project was started in July 2012 and is currently still in the developmental stages. It is projected that it could take 12+ months to get all of the material up. The good news is it's being added in order so users can begin reading while the latter material is being added. Until now, the only means of access to this material online were a few PDF, static html, and plain text versions from Google Books and Project Gutenberg.
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