[Electric engineering.] . Fig. C. 34. The circuit-closing devices used on bellwork usuallytake the form of a push, button. These are made in all sorts of styles. The very cheapones are seldom push buttons should beused where exposed to theweather. Fig. 7 shows the or-dinary round push button. Thewires enter through holes in thebase and attach to springs b andc. The cover d screws on, andwhen e is pushed, b and c cometogether, thus completing thecircuit. One cell of any good type ofbattery will ring a good bell overa short length of wire, but it is never advisable to rely up
[Electric engineering.] . Fig. C. 34. The circuit-closing devices used on bellwork usuallytake the form of a push, button. These are made in all sorts of styles. The very cheapones are seldom push buttons should beused where exposed to theweather. Fig. 7 shows the or-dinary round push button. Thewires enter through holes in thebase and attach to springs b andc. The cover d screws on, andwhen e is pushed, b and c cometogether, thus completing thecircuit. One cell of any good type ofbattery will ring a good bell overa short length of wire, but it is never advisable to rely uponless than 2 cells even on the smallest installations. When sev-eral cells are connected together to form a battery, the zincof one must be joined to the carbon of the next and the free. fig. § 28 INTERIOR WIRING. 27 terminals at the ends of the row of cells connected to theline wires. 35. Electric bells can be had of all sizes, from meretinklers up to the largest fire gongs. Very cheap bellsshould not be used. They require much battery power,and soon get out of order. Trouble is usually found first atthe contact points or the armature pivot. Contact pointsshould be tipped with platinum or silver; platinum beingmuch the better material for this purpose, as it never cor-rodes or tarnishes, but it is more expensive than silver,which is much used. 36. In an ordinary dwelling there are usually not lessthan three electric bells, one located at a convenient pointin the hall with a push button at the front door; one in thekitchen with a push at the back door, and one, a buzzer,located in the kitchen with a push in the dining-room bells may all be operated by the same battery. Thebattery should be placed in a cool place, but where it never iscold enough to freeze
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