Anthony's photographic bulletin for .. . s in the same direction. Soundwaves are a process of compression and expansion of the air, and longi-tudinal waves mean that process of compression and expansion ; con-sequently, if we are to imagine that these X rays of Prof. Rontgen arelongitudinal waves, we have to believe that the ether is compressible and expansible. Ther< very attractive feature with regard to this theory that longitudinal waves of the ether. It is found by experimenl with photography the transparency of bodies to these X rays is proportionate With their density. It has b
Anthony's photographic bulletin for .. . s in the same direction. Soundwaves are a process of compression and expansion of the air, and longi-tudinal waves mean that process of compression and expansion ; con-sequently, if we are to imagine that these X rays of Prof. Rontgen arelongitudinal waves, we have to believe that the ether is compressible and expansible. Ther< very attractive feature with regard to this theory that longitudinal waves of the ether. It is found by experimenl with photography the transparency of bodies to these X rays is proportionate With their density. It has been a long time an idea that the a< tion of gravity is due to some form of Longitudinal ?. :md it is consequently a very interesting feature of that th< pond in some respects to the action of iect, but till ii i, exceedingly interesting ? Millie point Of View. [Mr. S win ton »ok a photograph oi tie chairmans hand, the imilar to that described in the cast oi the purses, etc., .< ! ion | I he I ubo by means of a dia-. ..vvWL i49 gram. A scries of slides was then exhibited illustrating the nature ofthe positive and negative discharges and the discharge from a Teslacoil, and also a diagram showing the arrangement of the Tesla coilused by Mr. Apart from the form of the tube, the chief practical requirementsarc these : First of all, you want a very high vacuum, as high a vacuumas the coil you are using will produce luminescence in ; then you wantto have the electrodes as far as possible apart ; the tube must be of anuniform thickness of glass, so that it will not crack with the heat ; andit is of paramount importance that it should be made of German potashglass, because that kind of glass answers much better than lead are the chief requirements, except that if you are going to do alarge body you must have a large tube ; and in order to get sharpdefinition you must put that large tube a long way off, because, ofcourse, this photography is merely by shad
Size: 1342px × 1863px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1870, booksubjectphotogr, bookyear1870
