. 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. orter 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 decre
. 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. orter 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 soil after a heavy fall ofdew or rain. For this reason five, eight, ten, or fifteen per cent, mustbe deducted from the percentage indicated by the pointer, for hghtrain (snow, fog), moderate rains, and heavy, continuous
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Keywords: ., bookauthorhiscoxgardnerdexter18, bookcentury1900, bookdecade1910
