The principles underlying radio communication (1922)
United States. National Bureau of Standards, Ould, Richard Sheldon, 1889-, United States. Army. Signal Corps · Washington, Govt. Print. Off. · leaf 41
reference temperatures. SeeTable 21, Circular 74. 10. Current Control.—In electrical work the need is constantlyarising for adjusting a current to a specified value. This isusually done by varying the resistance of the circuit. Changesin the resistance of a circuit can be made by means of… … Fia.l3 Connection in 5>ln5 KtSiitarvce Wine ealUd resistance boxes or rheostats, dei>ending on theircurrent-carrying capacity and range. A resistance box consists of a group of coils of wire assem-bled compactl.v in a frame or box. (Figs. 11, 12. and 13.)It is so arranged that single coils or…
Telegraph, Wireless · Radio
Internet Archive · Public Domain Mark 1.0. Free to use for anything.
![An illustration from [Electric engineering.] (1902)](https://img.insideoutlibrary.com/img/200/ia-electricengineer04inte-141-48.webp)
