. 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. 238. The automatic electric controller, shown at the right, has a mag-netic dog that disengages a weight which falls against a lever and opensthe relief valve and quickly closes the valve by the greater pressure onthe rear of the piston. The screw spindle S closes the
. 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. 238. The automatic electric controller, shown at the right, has a mag-netic dog that disengages a weight which falls against a lever and opensthe relief valve and quickly closes the valve by the greater pressure onthe rear of the piston. The screw spindle S closes the valve as an ordinary stop electric push buttons are placed where needed for emergencies. 239- REVERSIBLE THROTTLE VALVE. In this design an angle or straight way valve may bemade convertible by rotating theflange connection of the two partsof the body. A most convenient design forfacilitating repairs. The valvespindle carries a bevel pinionmeshing in a sector gear on thevalve disk, which opens or closesby a 90° revolution on its face. 240. Plan of valve disk. 241. Sector gear on I02 STEAM POWER APPLIANCES. 242. COMPENSATING EXPANSION JOINT. Designed toprevent the forcing apart of the ordinary expansion joints in steam pipes. The joint is surrounded byan annular chamber of crosssection equal to the steampipe, in which a tightlypacked ring acts as a is admitted to thischamber by means of a by-pass. The tendency wouldbe to force out the piston,and so draw the ends of thepipe closer together, but asthe steam in the pipe and in the chamber is of the same total pressure,each force neutralizes the other, and the joint is rendered secure underall ordinary circumstances. The joints are made of steel pipe andforgings, excepting the glands, which are cast, and the first cost isvery little greater than that of an ordinary joint.
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Keywords: ., bookauthorhiscoxgardnerdexter18, bookcentury1900, bookdecade1910
