. 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. 287. FOG-HORN BUOY. A float anchoredat the edge of banks with an air pump operated bythe waves. The action of the sea is utilized in sucha manner as to blow desired blasts through a fog-horn by means of the compression and release of airinto and from a suitable air-ti
. 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. 287. FOG-HORN BUOY. A float anchoredat the edge of banks with an air pump operated bythe waves. The action of the sea is utilized in sucha manner as to blow desired blasts through a fog-horn by means of the compression and release of airinto and from a suitable air-tight chamber forming aportion of the buoy, this chamber being charged bymeans of a pump actuated by the movement of thesea. 123 124 HYDRAULIC POWER AND 289. CENTRIFUGAL PUMP. 288. ORIENTAL IRRIGATION WORKS of ye olden time and yet in use. An in-genious device for theage in which it ox-hide bucketand spout drawn by oxenwith Hnes D and E soarranged that the spoutline was stopped at Hand the bucket raised toautomatically empty thewater into the conveyingtrough. Spiral wings on a conical drumact as a gradual feeder to themain wings at the large endof the cone. The two sets of wings orblades are inclined at oppo-site angles to counteract endthrust. Wenzel patent. 290. Longitudinal section, showing both sets of wings. 291. VALVELESS ROTARY PUMP. The piston has a heli-coidal form. It is fixed upon an axle, which, running in stuffing boxes, passes through a cy-lindrical pump chamberclosed at both ends. Tworollers enter this chamber atright angles with the axleand bear against the obliquefaces of the piston. It re-sults from this that if thelatter is revolved, a back-ward and forward motionwill at the same time begiven which wi
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