. 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. reservoir are madeof steel wire, No. 22 Enghsh wire gauge, closelywound round a mandrel, ^/^ inch in diameter and10 inches long, on which they are tempered hardand afterward lowered to a suitable temper by being dipped in oil andignited two or three times, the burned
. 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. reservoir are madeof steel wire, No. 22 Enghsh wire gauge, closelywound round a mandrel, ^/^ inch in diameter and10 inches long, on which they are tempered hardand afterward lowered to a suitable temper by being dipped in oil andignited two or three times, the burned oil forming a japan that preventsthem from rusting in damp weather. Ink pencils of the barometer and other instruments are made bydrawing narrow glass tubing to a fine point, which lightly touches thepaper register, leaving a mark of red ink that has been diluted withabout one-quarter of its volume of glycerin. The glycerin preventsthe ink from drying too rapidly. To receive the atmospheric fluctuations a suitable ruled paper isfastened by means of small brass clamps, K K, to the board, H H,which is hung by rollers to the thick steel rod fastened to the sides ofthe case, on which the paper is carried from right to left by the clock, Jat the rate of y^ an inch per hour, by means of the pulley on the hourarbor of the MEASUREMENT OF POWER, SPRINGS. 39 45. REGISTERING AIR THERMOMETER. A glass tubebent into a circle with an air bulb at the top nicely balanced by coun-terweights on a knifeedge. Part of the tube, asshown by the heavy blackline, is filled with expansion and con-traction of the air in thebulb end moves themercury and carries thepointer up or down bychange of gravity. Acylinder moved by clock-work receives the record.
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Keywords: ., bookauthorhiscoxgardnerdexter18, bookcentury1900, bookdecade1910
