. Mechanical appliances, mechanical movements and novelties of construction; a complete work and a continuation, as a second volume, of the author's book entitled "Mechanical movements, powers and devices" ... including an explanatory chapter on the leading conceptions of perpetual motion existing during the past three centuries. a layer of soft down attached to a circular box containing coils of latter are heated by an electric current whose temperature is regu-lated by a thermometer placed on the cover. When the heat becomes toogreat, the rise of the mercury cuts the coils out of ci
. Mechanical appliances, mechanical movements and novelties of construction; a complete work and a continuation, as a second volume, of the author's book entitled "Mechanical movements, powers and devices" ... including an explanatory chapter on the leading conceptions of perpetual motion existing during the past three centuries. a layer of soft down attached to a circular box containing coils of latter are heated by an electric current whose temperature is regu-lated by a thermometer placed on the cover. When the heat becomes toogreat, the rise of the mercury cuts the coils out of circuit and allows themto cool. A coop for the chicks, in which the cover can be raised to ac-commodate with their growth. The only attention required is to sprinklethe eggs with fresh water and to turn them once a day. A rheostatregulates the current for a nearly uniform temperature of the heatingcoils. 176 ELECTRIC POWER AND 424. ELECTRICAL SOLDERING COPPER. The resistanceor heating coil is composed of small iron wire wound on insulating material (asbestos cloth).The coils are wound farenough apart to preventshort circuiting and theirelectric connections insulated and carried through the handle. 425. ELECTRIC WELDING APPARATUS. A shunt dynamocharges the 50 accumulator cells in series ; a voltmeter and an ampere-meter are inserted at V and A. Fromthe positive terminal of every fifthcell a wire leads to a plug switch boardU; from U the current passes througha variable resistance W, and fromthence through a flexible cable to thecarbon holder 2 and the carbon pen-cil K. The operator manipulateshis holder 2, the metal to be fused,placed upon the table, being joineddirectly to the negative terminal ofthe battery. By inserting the plugin the switch board U, the operator may obtain currents from 5 cells, twice 5, and so on to 10 times 5 cells. 426. Carbon holder, carbon pencil at work. 427. ELECTRIC WELDING. The
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Keywords: ., bookauthorhiscoxgardnerdexter18, bookcentury1900, bookdecade1910
