. Annals of the New York Academy of Sciences. Science. CAP OFF CAP ON Fig. II. Device for holding fluorescent screen in place, showing the cap off and the cap on. C—Screen holder. H—Black paper screen. O—Fluorescent crystals. D—Cap. P—Screws for securely fastening the cap. By the construction of the screen holder of the " X-ray De- tector," C, fig. 8, so that screens can be easily changed, a means is obtained by which comparative tests and examinations of dif- ferent fluorescent substances can be made. One method is as follows : If it is desired that two fluorescent materials be com-
. Annals of the New York Academy of Sciences. Science. CAP OFF CAP ON Fig. II. Device for holding fluorescent screen in place, showing the cap off and the cap on. C—Screen holder. H—Black paper screen. O—Fluorescent crystals. D—Cap. P—Screws for securely fastening the cap. By the construction of the screen holder of the " X-ray De- tector," C, fig. 8, so that screens can be easily changed, a means is obtained by which comparative tests and examinations of dif- ferent fluorescent substances can be made. One method is as follows : If it is desired that two fluorescent materials be com- pared ; screens of these substances are prepared, and then the farthest distance from an active Crookes tube at which each screen. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original New York Academy of Sciences. New York, New York Academy of Sciences
Size: 1544px × 1618px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1870, booksubjectscience, bookyear1877
