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Jtfly, 1883.] Photographing the Solar Corona. 7I ttainbow Glass. The soap-bubble colors upon glass are produced by a vapor, which is deposited on the hot glass before it goes into the annealing oven. The vapor comes from a mixture of protoehloride of tin, carbonate of baryta, and carbonate of strontian. It is said that the workmen of a Bohemian manufiu~'turer, wishing ro celebrate his arrival, kindled some Bengal lights in the annealing furnaces, and the piec('s which were in the fimmces alldoi:10.1016/0016-0032(83)90402-7 fatcat:het24smhwbakje4mybayxllhym