3 Matching Results
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Apparatus for Separating or Concentrating Ores.
Patent for an improvement to hydraulic separators used in frothing classification to increase the recovery of larger mineral particles.
Date:
October 21, 1919
Creator:
Cole, David
System:
The Portal to Texas History
Windmill.
Patent for a windmill with vanes that can compensate for varying wind speeds without being damaged by high winds.
Date:
October 21, 1919
Creator:
Ochoa, Victor Leaton
System:
The Portal to Texas History
Projecting-Machine.
Patent for improvements to a projector that relate to advertising. The inventor references adjustments to a previous patent, No. 1069521 from August 5, 1913. Adjustments include making the device more accurate and reliable, and to adapt it to be able to display opaque surfaces, postcards, and other printed items during any time of day. Additionally, the revoluble slide magazine has a mechanism that allows it to operate continuously without assistance from the operator.
Date:
October 7, 1919
Creator:
Bernard, Oscar C.
System:
The Portal to Texas History