File:Anthony's photographic bulletin for (1896) (14781587982).jpg

Identifier: anthonysphotogr1896newy (find matches)
Title: Anthony's photographic bulletin for ..
Year: 1870 (1870s)
Authors:
Subjects: Photography
Publisher: New York : E. & H.T. Anthony & Co.
Contributing Library: University of Illinois Urbana-Champaign
Digitizing Sponsor: University of Illinois Urbana-Champaign

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that the new process should be called Elec-trography. That is not an easy word to pronounce, and I cannol quiteunderstand his point of view. Not very Long ago Lord Kelvin stated,when Hertz made bis experiments which confirmed the electro-mag-theory of light of Clerk Maxwell, that those experiments annexedto the domain of electricity the whole science of optics. According totro-magnetic theory of light, there is no distinction between•(-magnetic waves and light waves ; there is no distinction be- Hertzian wa1 i and light waves; and it appears to me very diffi- raw any distinction between waves I the (thcr. tr, I ball begin a1 once and try some experi-or this reason: Th < amera I lub.
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145 we should begin at once, so that, if by chance our photographs shouldprove unsuccessful, we should have plenty of time to do others. (Mr. Swinton then placed on the table six dry plates, cut to lanternsize, and each enclosed in a double black envelope ; purses, spectacles,etc., were laid on the plates, and a Crookes radiant matter tube fixed inposition at a height of about 9 inches. The tube was illuminated bymeans of a Ruhmkorff coil, for twelve periods of fifteen seconds each,with alternate pauses of similar duration, to avoid over-heating andconsequent fracture of the tube. The plates were then removed anddeveloped, and the negatives obtained were shown on the screen at alater stage of the proceedings.) The lecturer continued : I have no doubt many members and a large number of the generalpublic do not know the difference between what are known as Crookestubes and what are known as Geissler tubes, and I therefore pro-pose to show you a number of both Crookes and Geissler tubes,

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