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| Keywords: The Swan lamp.jpg en Swan has done much towards the perfection of glow lamps Long before Edison he tried to obtain more durable carbon filaments Too little attention had been paid by other experimenters to the exhaustion of the vessel containing the carbon and also to the diminution of resistance at the ends of the carbon connected with the platinum wire Fig 439 shows a lamp by Swan The platinum wires are carefully fused into a little glass tube ending in two loops outside The lower portion consists of gutta-percha which has a glass screw by means of which the lamp might be screwed upon any ordinary gas-arm after removal of the burner Each of the platinum hooks is connected with one of the keys The carbon is ten centimetres long and is prepared from cotton fibres soaked in sulphuric acid 2 parts acid to 1 part water ; they undergo a similar change to paper when similarly treated i e artificial parchment is obtained The fibre which after the treatment is more tenacious is bent into the form required and is placed in a crucible filled with fine coal-dust hermetically closed and exposed to heat The carbons are fastened to the platinum wires in the following manner Their ends are made to overlap and are bound together by cotton which again is carbonised 1886 Fig 439 at http //archive org/stream/electricityinse02wormgoog page/n500/mode/1up page 462 in Electricity in the service of man by Alfred Ritter von Urbanitzky edited with copious additions by Richard Wormell Published by Cassell Company 1886 Unknown illustrator PD-old-100 Early incandescent light bulbs Scans from 'Electricity in the service of man' 1886 | ||||
