General Science

Cover General Science
General Science
Bertha M Clark
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The absence of air prevents the filament fromburning, and it merely glows and radiates the light.
[Illustration: FIG. 205. --The heating element in the electric stove. ] 291. Blasting. Until recently, dynamiting was attended with seriousdanger, owing to the fact that the person who applied the torch to thefuse could not make a safe retreat before the explosion. Now a finewire is inserted in the fuse, and when everything is in readiness, the ends of the wire are attached to the poles of a distan
...t batteryand the heat developed in the wire ignites the fuse.
[Illustration: FIG. 206. --An electric pad serves the same purpose as ahot water bag. ] 292. Welding of Metals. Metals are fused and welded by the use ofthe electric current. The metal pieces which are to be welded arepressed together and a powerful current is passed through theirjunction. So great is the heat developed that the metals melt andfuse, and on cooling show perfect union.
293. Chemical Effects. _The Plating of Gold, Silver, and OtherMetals.


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