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Reciprocating Electric Engine
Patent for "means for employing an ordinary continues current from a suitable source to produce an oscillating primary magnetic field of a solenoid-magazine and to use said magnetic field for setting a piston-like armature in a reciprocal axial motion to develop mechanical power in both directions" (lines 11-17).
Date:
June 13, 1905
Creator:
Wagner, Bruno Otto
System:
The Portal to Texas History
Account-Book.
Patent for a new and improved account book that is arranged to improve accuracy of record-keeping and facilitate the referencing of different accounts.
Date:
June 13, 1916
Creator:
Zimmerman, Charles Levy
System:
The Portal to Texas History