UNT Libraries Government Documents Department - 3 Matching Results

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Spirit Level.

Description: Patent for a spirit-level by Allan T. Gibson. Meant for helping users obtain level and perpendicular lines with more ease and accuracy, as well as for determining any intermediate angle.
Date: June 26, 1906
Creator: GIbson, Allen T.
Item Type: Refine your search to only Patent

Equalizer for Pump Rods

Description: Patent for an equalizer for pump rods. This invention is designed to "assist in elevating the column of water in a pump, is designed to sustain the pump rod in its fixed position" (line 11-14). Illustration included.
Date: June 13, 1911
Creator: Johnson, Robert H.
Item Type: Refine your search to only Patent
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