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Calculator
Patent for a calculator which consists of semicircular device with movable pointers and number indexes printed on it that allows the pointers to be moved to different numbers to produce the answer to a math problem such as calculating the cost of goods sold by the pound in a store.
Date:
December 21, 1909
Creator:
Goss, George Wilson
System:
The Portal to Texas History
Selective Call for Telegraph or Telephone Lines
Patent for a device that allows the user to ring a specific telephone or telegraph line without ringing the bells at other lines.
Date:
September 30, 1902
Creator:
Palmer, William, Jr.
System:
The Portal to Texas History
Screw-Driver
Patent for a screwdriver. Illustrations included.
Date:
December 29, 1908
Creator:
Winfrey, Edgar M. & Lilins, Thomas W.
System:
The Portal to Texas History