Apparatus for Obtaining a Vacuum.
Description:
Patent for a new and improved vacuum. This design utilizes a liquid pump, plates, tubes and valves to make "about as perfect a vacuum . . . as can be obtained by an ordinary pump" (lines 53-55).
Date:
July 27, 1880
Creator:
Ward, Lyman Henry
Item Type:
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Patent
Partner:
UNT Libraries Government Documents Department