. 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. 53. CENTRIFUGAL SPEED INDICATOR. Gravity of acolored fluid in the central and outer tubes is varied by the centrif-ugal force of revolution for a constant in-dicator. The machine consists of three tubes, a, byb^, which connect freely with one another,and are mounted v
. 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. 53. CENTRIFUGAL SPEED INDICATOR. Gravity of acolored fluid in the central and outer tubes is varied by the centrif-ugal force of revolution for a constant in-dicator. The machine consists of three tubes, a, byb^, which connect freely with one another,and are mounted vertically between conicalcenters. The tubes are sealed air tight sothat no liquid can escape or be added. Ascale is placed on a standard opposite thecentral glass tube, and is graduated to cor-respond to various speeds. When the ap-paratus is set in motion, the level of the col-ored liquids falls in the central tube a, andrises in b, and b^; by comparing the level ofthe liquid in a with the scale, the speed canbe read 42 MEASUREMENT OF POWER, SPRINGS. 54. HYGROSCOPE. In the instrument a strand, H, of hair, de-prived of all fat, is secured at its upper end at /, and at its lower endto a crank, k^ carried by the shorter and heavier arm,g, of an angle-lever pivoted at O. The longer andlighter arm of the lever serves as a pointer and termi-nates in a trident, Z. Hair has the property of ex-panding or lengthening with an increase of relativemoisture and of contracting with a decrease in rela-tive moisture. Since the strand of hair is constantlyunder the tension imposed by the weight of the arm,g, an increase or decrease of relative moisture and acorresponding expansion or contraction of the hairwill be accompanied by a movement of the pointer,Z, which plays over a double scale. The centralpoint of the arm, Z, indicates on the lower scale(graduated from o to 100) the relative which are employed at no great eleva-tions are influenced by the moisture of the s
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Keywords: ., bookauthorhiscoxgardnerdexter18, bookcentury1900, bookdecade1910
