Journal - Franklin Institute of the State of Pennsylvania (1826)
Franklin Institute, Philadelphia, Franklin Institute (Philadelphia, Pa.) · [Philadelphia : Franklin Institute] · leaf 308
elling screws. Tlie ini-age received on the plate holder (7), which is supported on a table.(?) is photographed precisely as in the case of the Electric light asabove described. The same focussing apparatus {d) is employedand the ammonio-sulphate cell should invariably be inserted, butthe ground… … The Magnesium lamp used by me for this purpose was the two-ribbon lamp of the American Magnesium Company, (No. 2 LibertySquare, Boston, Mass.,) sold by that company for Magic Lanternpurposes, price $50. The ribbon weighs about 52 centigrammesper metre, and is sold at $2.50 per ounce. Two ounces…
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