ch ex- but until lately no efficient substitute for this frog has Astoria, Oregon. tend through the several floors, and is suspended by a been devised. rope attached to the top of the waiter, passing over a Mr. James Baird, of Chignecto Mines, Nova Scotia, pulley at the top of the waiter shaft,… … It is the duty of inventors to use reasonable dili- LAESEN'S DUMBWAITEE. BAIRD'S IMPROVED RAILROAD FROG. gence in reducing their conceptions to practice and applying for patents when desired, and they cannot around a pulley at the lower end of the waiter shaft, tracks the rails are removed, and a…
Statutes · Munn · Pivoted · Device · Patents · Scientific American · Railroad · Baking powder · Years ago · Congress approved · Perspective view · Approved february · Baking powders · Steam engine · San jacinto · Steam yacht
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