THAT the progress of electricity during the last decade has been great appears in many ways; but none shows this progress more strikingly than a comparison of a new and up-to-date book on practical ...

THIS book is intended to be an elementary manual for a laboratory course in practical electricity. It contains instructions for carrying out a number of experiments designed to illustrate the ...

Scientific American is part of Springer Nature, which owns or has commercial relations with thousands of scientific publications (many of them can be found at www ...