on, and manageability. wear and tear caused by the use of the ordinary frog, but until lately no efficient substitute for this frog has been devised. rope attached to the top of the waiter, passing over a 0 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- LARSEN’S DUMBWAITER, 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…
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