. The principles and practice of roentgenological technique . 3 Z Fig, 297.—Case for filing and examining reductions(lantern slides). The frame is usually drawnout in front of an illuminated surface. Fig. 299.—The Wheatstone or reflecting stereoscope. Hewitt mercury vapor tubes is to be preferredto any other and may be applied in boxes con-structed either for transmitted or reflected light.(Figs. 293, 294, 296). If not too bright andproperly diffused, it is by far the best source. and permits the inspection of six plates of thelargest size. (Fig. 296.) Viewing of Stereo Plates Stereoscopic exp
. The principles and practice of roentgenological technique . 3 Z Fig, 297.—Case for filing and examining reductions(lantern slides). The frame is usually drawnout in front of an illuminated surface. Fig. 299.—The Wheatstone or reflecting stereoscope. Hewitt mercury vapor tubes is to be preferredto any other and may be applied in boxes con-structed either for transmitted or reflected light.(Figs. 293, 294, 296). If not too bright andproperly diffused, it is by far the best source. and permits the inspection of six plates of thelargest size. (Fig. 296.) Viewing of Stereo Plates Stereoscopic exposures may be viewed inseveral ways: 1. Prism stereoscopes.
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectradiogr, bookyear1920
