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
4- 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 manner of… … Fig. 146. ELECTRICAL ENGINEERING 307 radiograph of a skull is shown opposite page 15. Time ofexposure was only a minute. In this picture it may be seen(see dark spots) that some rays penetrated the bones of theskull and affected the plate, which in this case was anespecially prepared radiographic…
Electrical engineering
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