‘‘double revolving plate machine,” although it does have two revolving is made of a metallic disk two inches or more in dia- word, and thata principle old as the hills should be plates. The latter machine is simply an ordinary meter, and hollow, so as to have véry gradually believed by the publicto… … mentioned. The advantage of this of the true principles to be ob- new form of machine becomes es- served in the use of steel and iron pecially marked during moist weather. At such times edges. ordinary frictional machines will not work at all, and eighth of an inch, and nearer the other electrode,…
Internet Archive · Public domain (published before 1931). Free to use for anything.
