. 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. 848. TRENCH BRACE. An up-to-date contractors appliance for bracing trenches. The large handlenut and screw give the brace greatpower, and the socket bearings ac-commodate the brace to OpeningFanjights^ Pen Ventlato

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