[Electric engineering.] . ghting is to be used on thesame fixture with the electric light: a. No part of the gas piping or fixture shallbe in electric connection with the gas-lighting cir-cuit. b. The wires .used with the fixtures must havea non-inflammable insulation, or, where concealedbetween the pipe and shell of the fixture, the insu-lation must be such as required for fixture wiringfor the electric light. c. The whole installation must test free from grounds. d. The two installations must test perfectly freefrom connection with each other. 48 INTERIOR WIRING. 28 67. Since the battery is
[Electric engineering.] . ghting is to be used on thesame fixture with the electric light: a. No part of the gas piping or fixture shallbe in electric connection with the gas-lighting cir-cuit. b. The wires .used with the fixtures must havea non-inflammable insulation, or, where concealedbetween the pipe and shell of the fixture, the insu-lation must be such as required for fixture wiringfor the electric light. c. The whole installation must test free from grounds. d. The two installations must test perfectly freefrom connection with each other. 48 INTERIOR WIRING. 28 67. Since the battery is momentarily short-circuitedevery time a spark is obtained, it would soon run down ifthe contacts on the burner were to remain permanentlytouching. To give notice of this, a relay (Fig. 35) may beused in series with the battery, the current entering at b andpassing out at c, after circulating around the coil. Themagnetic circuit is completed by an armature a, which isheld back against a stop by the weight w when no current. Fig. 35. is passing. If a short circuit occurs, the armature isattracted, and the spring d is pressed against the platinum-tipped screw s, completing a local circuit by means of thewires e, f through a vibrating bell and one-cell current used in lighting the gas at a burner is of suchshort duration that the bell is not rung. A modification ofthis arrangement is to provide an armature on the sparkcoil itself, which shall close a local alarm circuit when thebattery is short-circuited. 28 INTERIOR WIRING. 49 APPARATUS FOR MULTIPLE-LIGHTING STSTEM. 68. The multiple, or flash, system, of gas lighting isused in large halls where many lights are installed in fixed spark gap is used at each burner, both of the pointsbeing insulated from each other and from the gas pipe,except the last point of a series, whichis grounded. The style of burner usedis shown in Fig. 36, in which a and bare the points of the spark gap. Tocomplete the connection between
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