Knight's American mechanical dictionary : a description of tools, instruments, machines, processes and engineering, history of inventions, general technological vocabulary ; and digest of mechanical appliances in science and the arts . Gas~U^litas. platinum coilplaceil in a voltaiccircuit. The electro|iho-rus has iussuniedmany forms: aglass ]»iston in ametallic batonlined with Cantonflannel ; a pair ofdisks with cdoth-lined faces, etc. (SeeELErniiiPiioKUs.)Kig. 2181 showsone form in whichtlie device is at-tached to the stop-cock, so that theact of turning the same to let on g;issh:ill generate
Knight's American mechanical dictionary : a description of tools, instruments, machines, processes and engineering, history of inventions, general technological vocabulary ; and digest of mechanical appliances in science and the arts . Gas~U^litas. platinum coilplaceil in a voltaiccircuit. The electro|iho-rus has iussuniedmany forms: aglass ]»iston in ametallic batonlined with Cantonflannel ; a pair ofdisks with cdoth-lined faces, etc. (SeeELErniiiPiioKUs.)Kig. 2181 showsone form in whichtlie device is at-tached to the stop-cock, so that theact of turning the same to let on g;issh:ill generate a spark at th>^ breakof the circuit betW(H;n the point (i and the tip of theburner c. The other mo«le of gas-lighting hy electricity isby means of a voltaic circuit. A battery is placedin any convenient place, ami is conncited by in-sulated copper wiivs with the burnei-s. A <oil oftine platinum wiic, forming a part of tlie circuit, isplaced above and a little on one side of the opening Fig. 2182. g:us, which has been previously turned on. Or, abreak may be maile in the circuit inunediately abovethe gas oritice, and tlie sjiark leaping across the in-terval lights the gas. These modes have beeniulopted in a number of legislative halls, publicbuildings, manufaett>ries, and stores, on both sides *of tlic Atlantic, and the electric, cnrrent has beenalso the means of turning on the gas at the by means of a ratchet-wheel on the ofttic gas-coi-k, which is turned by llic successive pul-sations of the arniuturc, the latter being alternatelyaituated by electric connection and a retiactingspring. This device is shown in Iig. 2182. Thesliding rod E is a stem attached to the armature B,and has a click O whii h acts n|ion the tcetli of theratchet-wheel //, whose a.\is is the sj)igot of thegas-cock. When the voltaic current is ])assedthrough the coils ..•/, the armature H is attracted,and the ratchet moved one tooth ; the voltaic con-nection ceasing, the arma
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