Morton, Edward Reginald, 1867- · New York : E.B. Treat & Co. · leaf 126
e tube is the Wehnelt penetro-meter, which has already been referred to, and it will befound the best policy to get one of these at the beginningand use no other. The most generally useful degree ofpenetration registers No. 9 on the scale. CHAPTER IX.RADIOSCOPY. Having got our apparatus working… … Fig. 44. Screen for Radioscopy. These screens are made of substances which fluoresce toX-rays, the substance being coated on stiff cardboard andmounted in a wooden frame. Many materials may beused, but the most suitable is the platino-cyanide ofbarium, and all screens are now made of this. It…
