. A manual of electro-static modes of application, therapeutics, radiography, and radiotherapy . ted when passing from one medium toanother of different density. (3) They are but slightly re-flected and are absorbed by substances which they do notpenetrate. (4) They affect photographic dry plates as do lightrays. (5) They produce fluorescence of many substances,notably platino-barium cyanide, willemite, tungstate of cal-cium, rock salt, fluorspar, and glass. This property is notice-able also in the greenish fluorescence of the glass of all tubes. The penetrating qualities of the rays relative
. A manual of electro-static modes of application, therapeutics, radiography, and radiotherapy . ted when passing from one medium toanother of different density. (3) They are but slightly re-flected and are absorbed by substances which they do notpenetrate. (4) They affect photographic dry plates as do lightrays. (5) They produce fluorescence of many substances,notably platino-barium cyanide, willemite, tungstate of cal-cium, rock salt, fluorspar, and glass. This property is notice-able also in the greenish fluorescence of the glass of all tubes. The penetrating qualities of the rays relative to differentsubstances depend but partially upon any law of specific gravity,atomic weight, or density (note Figs. 1 and 2, and description).Organic substances, except bone, which is largely calcium, are * Recent investigations have demonstrated that they ate refracted. l62 STATIC ELECTRICITY. generally transparent to the rays. Wood fiber, muscle, andother vegetable and animal matter are to a variable extentpenetrated, the density and thickness of the object lessening the iimiu / i 3 * * * 7. Fig. I.—Showing the Relative Penetration by the X-Ray of DifferentMetals, Colored Solutions, and Other Substances; Indicating that no Law ofSpecific Gravity or Density Governs Transmission. I, Vial of water; 2, air-slacked lime in bottle; 3, empty bottle; 4, thioninstaining fluid; 5, hematoxylin (stain); 6, aurantia (stain); 7, methyl blue(stain); 8, indolin (stain); 9, sol. cocaine; 10, chloroform; II, salt solution; 12,Garlock packing, 1/16 in.; 13, oil cloth; 14, linoleum; 15, ring of vulcanite; 16,soft rubber ring; 17, box of crayons: a, red; bt indigo; c, yellow; d, brown;t, green; /, white; <?, orange; /;, black; 18, glass dropper; 19, nickel ring; 20,stick of carbon with iron core; 21, sheet lead (32 gauge); 22, block tin (22gauge); 23, Crookes composition (22 gauge); 24, Crookes composition (32gauge); 25, aluminum (22 gauge); 26, Garlock packing. distinctness of the fluorescen
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