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Submarine Telescope.
Patent for submarine telescope using a pair of longitudinal tubes, mounted lens, rigid rods, electric light bulb, and chains for securing to the boat. Intended as useful improvements to submarine telescopes with the objection to assist in locating submerged objects. Accompanied with illustrations.
Date:
April 22, 1919
Creator:
Armstrong, William S.
System:
The Portal to Texas History
Culvert.
Patent for metal road culvert improvements. Light weight, but sturdy, interlocking metal sheets are used. They can be stacked for cheaper and easier shipping. The culvert allows large amounts of water to flow through.
Date:
April 22, 1913
Creator:
Youngblood, David Franklin
System:
The Portal to Texas History