Henry and Hora's modern electricity; a practical working encyclopedia (1915)
Henry, James. [from old catalog], Hora, Karel Jan, 1881- [from old catalog] joint author · Chicago, Laird & Lee, inc. · leaf 309
Fig. 143.Shows a hand with shot located in the fingers. 305 306 MODERN ELECTRICITY The fluorescent screen by means of which such effects areobserved, is usually enclosed in a black box, and is called afluoroscope. Two commercial forms of such a fluoroscopeare shown in figs. 144 and 145. … FlG144- Fio. 145. When, instead of the fluoroscope a photographic platewrapped in black paper so as to protect it from sun-light is sub-stituted (see fig. 146) theX-rays penetrate the papercover and produce on theplate a picture, called aradiograph, which may bedeveloped and fixed in theusual…
Electrical engineering
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
![An illustration from [Graphophone patents] (1878)](https://img.insideoutlibrary.com/img/200/ia-graphophonepaten07unit-769-501.webp)
