ning from matically. When, as frequently happens, the water this cause is absolutely obviated. is dangerously low, men are at once set to work to As may be seen from the accompanying illustra- rake away the grass from the racks before the fore- tion, the apparatus is of simple design and operation,… … to be centrally placed below the center of the disk of parchment. The upper plate is then closed down flat A. Plunger. C. Cylindrical in its normal position upon the sheet of parchment. AN INGENIOUS WATER GAGE IN USE AT NIAGARA. In order, however, to prevent the plates holding the paper too…
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