ressure on the treadle is removed, a spring returns the lever to its chest. In the under side of the valve is an exhaust cavity by means of a needle or narrow scraper, which cuts normal position and thus closes the door. Another adapted to alternately connect the inlet ports with one through the… … lately accomplished in a very simple, cheap, and expe- MOORS’ FURNACE DOOR OPENER. ditious way what is usually a difficult and expensive operation—the laying of a long line of pipe in deep water. He had occasion to lay nearly 1,000 feet of treadle gives vertical movement to a rod on the upper with…
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