Anthony's photographic bulletin for .. . turnedon and the Crookes tube excited, the fluoroscope is directed towardsthe end of the tube, when it will be seen that the bottom of the boxbecomes luminous, even if a board an inch thick is interposed. Onplacing the hand between the tube and the fluoroscope a very indistinctoutline of the bones may be seen. Objects such as keys and coins stopthe rays, and their presence is clearly indicated. There may be a greatfuture for an instrument of this description, but considerable improve-ment must be made before it can be truly practical. The great want at
Anthony's photographic bulletin for .. . turnedon and the Crookes tube excited, the fluoroscope is directed towardsthe end of the tube, when it will be seen that the bottom of the boxbecomes luminous, even if a board an inch thick is interposed. Onplacing the hand between the tube and the fluoroscope a very indistinctoutline of the bones may be seen. Objects such as keys and coins stopthe rays, and their presence is clearly indicated. There may be a greatfuture for an instrument of this description, but considerable improve-ment must be made before it can be truly practical. The great want at present is a means of converging the rays. Again,but little is at present known regarding the best form of tube, degreeof vacuum, shape of cathode disk, position of anode, kind of sensitiveplate, backing for such plate, and so on, through all the details. Acalm survey of the present state of knowledge regarding the new pho-tography reveals the fact that practically nothing has been added tothe principles enunciated by Prof. Rontgen. 112. [tmd of N60II1 ililllHIOir Interest. warn CHAPMAN JONES, in Photography, remarks: We may well askwhether the X rays produce the developable action in gelatin o-bromide plates by their direct action or by a secondary action. Is, forexample, the plate sufficiently fluorescent to be excited by the X raysinto luminosity, or, if not to luminosity, perhaps the excitation resultsin the production of invisible (say ultra-violet) rays at the surface ofthe plate, and then these affect it as we know they do. If this kind ofsecondary action takes place, we may not have here sensitiveness toany new force, but merely the production of the new force of radiationswhich we know are photographically active, and we shall then have nonew fundamental principle to add to our knowledge of the other hand, light is only a form of energy; it is stated that thedevelopable condition can be induced by other forms of energy, such aspressure, contact with cert
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectphotogr, bookyear1870
