The boy's modern playmate : a book of sports, games, and pastimes (1890)
Wood, J. G. (John George), 1827-1889, compiler, editor, Dalziel, George, 1815-1902, engraver, Dalziel, Edward, 1817-1905, engraver · London ; New York : Frederick Warne & Co. · leaf 683
ircuit are greater in strength than when the bar is removed, the presence of the bar most mate¬ rially increasing the induction. This rough arrangement is the foundation of an induction coil : the helix round the soft iron is the primary coil., the out¬ side wire is the secondary coil. By… … Fig. 27. To M. Ruhmkorff is due the credit of perfecting the induction coil which now bears his name. The coil consists of the following parts : 1. The core of soft iron, or electro¬ 3. Secondary coil. 4. Contact-breaker. magnet. 2. Primary coil. 5. Condenser. In experimenting upon electricity…
Games · Amusements · Sports · Recreation · Pets
Internet Archive · Harold B. Lee Library · Public domain (published before 1931). Free to use for anything.
![An illustration from [Electric engineering.] (1902)](https://img.insideoutlibrary.com/img/200/ia-electricengineer01inte-156-63.webp)
