. 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. ^ SS3- PNEUMATIC BALL PUZZLE. A ball laid on the mouth of a flanged tube, as inthe cut, can not be blown off by an air jet, butwill continue to roll around on the flange, asshown by the dotted lines. 334. PNEUMATIC DISK PUZZLE. A light circular plate withpin guid
. 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. ^ SS3- PNEUMATIC BALL PUZZLE. A ball laid on the mouth of a flanged tube, as inthe cut, can not be blown off by an air jet, butwill continue to roll around on the flange, asshown by the dotted lines. 334. PNEUMATIC DISK PUZZLE. A light circular plate withpin guides can only be lifted a small distance by an air jet from the flanged tube. The theory is thatthe momentum of the air as itsuddenly spreads to a larger cir-cumference causes a partialvacuum near the outer edge, thusholding the plates so near together that their circumferential area cor-responds with the area of the central jet. 335. PNEUMATIC BALL PUZZLE. A light ball is held in ajet of air from a vertical to an angle of about 30° and revolves with considerable velocity. A light ball placed in a con-ical cup over a jet of air will beheld there and not driven offwhen the cup and jet are re-versed. A card placed on an invertedflanged jet of air, as at V, V,will not drop, even with a con-siderable weight hanging to it. ;^;36. Inve
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