Johnston Air Compressor, Patent Model
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It is constructed as a cylindrical casing mounted upon a stationary horizontal shaft about which it oscillates. Two diaphragms extend in radial planes from the inside and top of the casing to a bearing on the upper side of the shaft. The space between these diaphragms is wedge-shaped. The two spaces thus formed are valve spaces, inlet and outlet, respectively. Flap valves are let into the diaphragm connecting the valve spaces with the lower part of the casing interior. A third diaphragm, called a lug, is fixed to the underside of the shaft and extends downward to the cylinder casing."}, {"label": "Description", "content": "In use the casing is filled with water to the level of the center of the shaft. When the case is rocked the water is held approximately stationary by the lug and the air between the surface of the water and the diaphragm on the down side is compressed while a partial vacuum is formed in the space between the surface of the water and the diaphragm on the up side. The compressed air escapes through the outlet valve and air is drawn into the up side through the inlet valve. As the casing is rocked back and forth it is in effect a double-acting bellows."}, {"label": "Description", "content": "Reference:"}, {"label": "Description", "content": "This description comes from the 1939 Catalog of the Mechanical Collections of the Division of Engineering United States Museum Bulletin 173 by Frank A. Taylor."}, {"label": "Location", "content": "Currently not on view"}], "name": [{"label": "inventor", "content": "Johnston, William"}], "publisher": [{"label": "Related Publication", "content": "Frank A. Taylor. Catalog of the Mechanical Collections of the Division of Engineering United States National Museum, Bulletin 173"}], "place": [{"label": "place made", "content": "United States: District of Columbia, Washington"}, {"label": "associated place", "content": "United States: District of Columbia, Washington"}], "physicalDescription": [{"label": "Physical Description", "content": "wood (overall material)"}, {"label": "Measurements", "content": "overall: 9 3/8 in x 10 1/8 in x 9 in; 23.8125 cm x 25.7175 cm x 22.86 cm"}], "dataSource": [{"label": "Data Source", "content": "National Museum of American History"}], "objectType": [{"label": "Object Name", "content": "engine, steam, model"}, {"label": "Object Name", "content": "patent model, compressor, air"}, {"label": "Object Type", "content": "Patent Model"}]}}, "url": "edanmdm:nmah_847607", "hash": "fe7a43aa204c56b52f483358f7383db89ad1cb0f", "docSignature": "880052554691eec5a339837e4f09f2e9", "timestamp": 1663782597, "lastTimeUpdated": 1655973461, "title": "Johnston Air Compressor, Patent Model"}