[NM023102], Technical Note, Arthur Edwin Kennelly, April 23rd, 1889


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[NM023102], Technical Note, Arthur Edwin Kennelly, April 23rd, 1889

Editor's Notes

[continuation of oscillation experiments] Tried a number of different minerals for transmissive power, the specimens having been lent by Prof. Egleston of Columbia College. Some 50 quartz specimen sections were tried, and of these only two were found to be opague. Both were parallel to the axis but one was [plane?] concave. The other 24mms squre was a biwave plate. A small lamina from this was transparent as also was the whole section laterally. The folllwoing opaque minerals were found.##Tourmaline. Clear transparent beryl. Transparent Casrbonate of lead, Emeral Beryl, Arragonite, Alum, Barium sulphate.##Finding that a section of quartz [two lines perhaps to indicate vertical] Axis was transparent, carefully examined the one of het Edison collection already recorded as opaque. Discovered that it was backed by a glass plate cemented with canada Balsam. On removing these the plate was at once transmparent. Also two hyperbolic plates of quartaz united by canada balsam in the Edison collection were partly separated and cleansed. The separate sections were transparent but where still united by balsam, the pair remained opague.##Amethyst was found to be transparent when clear and colorless and three specimens in a partly colored and partly clear state were transparent to the influence whenever the clear portions were brought over the window.##A small cube (1 cm) of smoky quartz was transparent to influence.



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Thomas A. Edison Papers, School of Arts and Sciences, Rutgers University
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