. 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. 39. ANEMOMETER. Robinsontype. For measuring the velocity ofthe wind. The worm screw runs inone of a train of geared index wheelscarrying pointers. The dials are markedfor direct reading of from mile, imile, 10 miles, 100 miles, 1,000 miles;so that the difference o
. 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. 39. ANEMOMETER. Robinsontype. For measuring the velocity ofthe wind. The worm screw runs inone of a train of geared index wheelscarrying pointers. The dials are markedfor direct reading of from mile, imile, 10 miles, 100 miles, 1,000 miles;so that the difference of two readingsand the time gives a ready solution ofthe wind 35 36 MEASUREMENT OF POWER, 40. ELECTRIC SIGNAL ANEMOMETER. Consists of fourhollow hemispheres or cups fixed to the ends of two horizontal rods Acrossing each other at right angles and supported on a vertical shaft D whose worm thread is geared into thewheel H, On the face of wheel H arebeveled projecting pins E which engagewith a beveled projection on the spring pins are so arranged on wheel H asto momentarily close circuit through asingle stroke bell for every twenty-fiverevolutions of the cup arms A. Theelectric circuit starts at the insulatedbinding-post B, goes^hrough wire tothe insulated spring C, where it is com-pleted to spring I to frame of instrumentand the uninsulated binding-post binding-posts B and F, wherestart the line wires, the circuit is com-pleted through bell and battery. 41. METALLIC THERMOMETER. The instrument is pro-vided with two series of hard rubber pulleys mounted on studs project-ing from a board. A fine brass wire(No. 32) attached to the board atone end passes around the
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