. 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. 486. SCREW blades. Case type. W^ith outwardthrust. Narrow blades for high two and a half times the of blades curved. 487. Plan of propeller in the plane of rotation. 488. SHEET METAL PROPELLER. Davis type. The bladesare made of
. 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. 486. SCREW blades. Case type. W^ith outwardthrust. Narrow blades for high two and a half times the of blades curved. 487. Plan of propeller in the plane of rotation. 488. SHEET METAL PROPELLER. Davis type. The bladesare made of boiler plate, or of plate steel, of equal thickness through-out. They are cut from a fiat plate,the holes for the reception of the pro-peller shaft made, and then either byhammer, rolls, or formers curved tothe proper shape. Each blade isprecisely alike, so that if one should bebroken a dupHcate could be readilyfitted. A collar is secured upon the shaft,and the inner legs of the blades bearfirmly against it. The sleeve, B, keepsthe legs of the blades at the properdistance apart, and the collar, C, andnut secures all in place. To hold the blades in position against theleverage of the water, bolts may be passed through the collars and bladeslongitudinally with the shaft, or the blades may be held by a feather onthe 196 NAVIGATION, VESSELS, MARINE APPLIANCES, ETC.
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Keywords: ., bookauthorhiscoxgardnerdexter18, bookcentury1900, bookdecade1910
