. Induction coils : how to make, use, and repair them including Ruhmkorff, Tesla, and medical coils, Roentgen radiography, wireless telegraphy, and practical information on primary and secondary battery . silverspring, carried on a lever, which latter ispulled across the tip so as to make and breakthe circuit at the burner orifice. Someburners are provided with a ratchet arrange-ment, by which pulling the lever once turnson and lights the gas, pulling again turnsit off; others require the gas to be turnedon first. Reference to Fig. 56 will show theconnections to two burners P P and anautomatic
. Induction coils : how to make, use, and repair them including Ruhmkorff, Tesla, and medical coils, Roentgen radiography, wireless telegraphy, and practical information on primary and secondary battery . silverspring, carried on a lever, which latter ispulled across the tip so as to make and breakthe circuit at the burner orifice. Someburners are provided with a ratchet arrange-ment, by which pulling the lever once turnson and lights the gas, pulling again turnsit off; others require the gas to be turnedon first. Reference to Fig. 56 will show theconnections to two burners P P and anautomatic burner A, to be described <:oil C is a core of soft iron, aboutJ inch diameter and eight to ten inches long,wound with from two to four pounds ofmagnet wire, Nos. 12 or 14 B & S. Oneside of the battery goes to ground or to thegas pipe, thus forming the return wiring on the fixtures is done withNo. 20 to 24 B & S gas fixture wire, insu-lated with four windings of silk or is fastened to the lacquered brass workby means of thick shellac varnish, it being Gas Lighting, 169 tied on first with thread, which can readilybe removed when shellac is dry and Fig. 56. The wire is held on the insulated collar ofthe burner by a small nut and screw, and I^O Gas Lighting. great care must be taken to ensure nogrounding. The setting up of a gas-lightingoutfit is extremely simple, but it often failsfor want of care. There must be the bestpossible insulation between wire and metalwork. Automatic Burners. There are several forms of these burners,but the principle of all is the same. A gasburner protrudes from the top of a brasscase which encloses the actuating mechan-ism. This mechanism consists of twoelectromagnets, the armature ol one open-ing a valve and allowing the gas to flow, atthe same time vibrating a platinumTtippedrod, which produces a series of sparks at theburner tip. These sparks ignite the gas, anda second magnet is provided to shut off the
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