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Ceiling-Plate.
Patent for improvements to ceiling plates that allow a ceiling plate through which a pipe passes to remain securely attached to the ceiling (or other surface) even while the pipe expands or contracts.
Date:
June 19, 1917
Creator:
Donnelly, John R.
System:
The Portal to Texas History
Aeroplane.
Patent for improved propulsion for airplanes involving propellors in the front and rear of the plane. This aids in regulating air currents to stabilize flight, landing and speed. The patent includes illustrations.
Date:
June 12, 1917
Creator:
Campbell, John R.
System:
The Portal to Texas History
Reel
Patent for an improvement in reels. The reel features improvements in how to attach the end of a film strip to the reel for winding.
Date:
June 12, 1917
Creator:
Allen, Harry Porter
System:
The Portal to Texas History