A Description of the Safety Lamp, Invented by George Stephenson. to Which Is Added, an Account of the Lamp Constructed by Sir H. Davy. [With] a ... the Newcastle Papers, With Other Documents, - Softcover
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1817. Excerpt: ... flame with a substance less liable to injury than glass, which, at the same time that it admits the air, transmits the light," I cannot wonder that he still continues as little acquainted with the principles of the wire gauze lamps, as he was of their safety, when he first saw them in January, 1816. But I hope that the veil of mystery, which holds the philosophy of this beautiful invention from his eyes, will soon be removed, and that he will have an opportunity of seeing every thing belonging to it satisfactorily explained, for all its principles are well understood. In the mean time, he will, I am sure, rejoice that the gentleman, against whom he pretends to run in the race of science, has lately effected another new discovery of great importance to the coal miner. In a letter, dated January 24,1817, Sir H. Davy says, " I have succeeded in producing a light perfectly safe and economical, which is most brilliant in atmospheres in which the flame of the safe lamp is extinguished, and which burns in every mixture of carburetted hydrogen gas that is respirable." "It consists of a slender metallic tissue of platinum, which is hung in the top of the interior of the common lamp of wire gauze, or in that of the twilled lamp. It costs from 6d. to Is. and is imperishable." "This tissue, when the common lamp is introduced into an explosive atmosphere, becomes red hot; when the flame goes out, i. e. when the atmosphere is no longer explosive, the platinum becomes white hot, and continues to burn the gas in' contact with it, as long as the air is respirable: when the atmosphere again becomes explosive the flame is relighted." "I can now burn any inflammable vapour either with or without flame at pleasure, and make the wire consume it either with a red or a white hea...
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