Machinery and processes of the industrial arts, and apparatus of the exact sciences (1869)
Barnard, Frederick A. P. (Frederick Augustus Porter), 1809-1889 · Washington, Govt. print. off. · leaf 446
he idea of turning back upon an electro-magnet, for the sake of aug-menting its power, the current generated by itself in the envelope of anarmature revolving before its poles, is not original with Mr. Ladd. Itis the second armature, introduced for the purpose of generating a cur-rent capable of… … Fig. 90. Fig. 91,
Machinery · Scientific apparatus and instruments
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
![An illustration from [Electric engineering.] (1902)](https://img.insideoutlibrary.com/img/200/ia-electricengineer03inte-339-212.webp)
