. 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. HOROLOGICAL, TIME DEVICES, ETC. 267 portion to the speed of the two wheels, e /; but as these wheels move inopposite directions, it consequently follows that one-half the difference in the rates is lost,or instead of mak-ing a completer e V o 1 u tion—thedifference be
. 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. HOROLOGICAL, TIME DEVICES, ETC. 267 portion to the speed of the two wheels, e /; but as these wheels move inopposite directions, it consequently follows that one-half the difference in the rates is lost,or instead of mak-ing a completer e V o 1 u tion—thedifference betweenI and 2—i t h a sonly recorded halfa revolution. Now, to com-pensate for thiserror—i n otherwords, to regainthe half revolutionlost—the wheelson the upper endsof the shafts, a b,have 60 teeth each,and the pinions atthe lower endshave 30 teeth each;and as the drivingwheels, c d, having90 teeth each, areconnected through. 700. the pinions, shafts a b, and upper wheels with the wheels, e /, also of90 teeth, the differential motion will be compensated. Now, as the clock marking sidereal time gains at the rate of about 4minutes in 24 hours, or 10 seconds in i hour, and as 10 seconds is one-sixth of a minute, it will take 6 hours to complete one revolution of thehand on the differential motion, which is the period of i minute in rightascension; 15 days 6 hours is i hour, and i year is 24 hours in the samemeasure. The hour hand on the large dial, therefore, represents the sun^apparent yearly motion among the stars. 268 HOROLOGICAL, TIME DEVICES, ETC. 701. NOVEL CLOCK. The novelty of the clock consists prin-cipally in the escapement. Beneath the main mechanism is placed a tilting table pivoted upon studsprojecting from the center of itslong sides, so that it is free to havea seesaw movement. Upon theupper surface of the table is formeda zigzag groove in which travels asmall steel ball. The path ismade up of
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Keywords: ., bookauthorhiscoxga, bookcentury1900, bookdecade1910, bookyear1910
