Henry Essex patented his design in 1902 (US patent 723,660) the engines were built by W. H. Smith of Buffalo, in the state of New York.
A number of engines were built to Essex's designs :

  1. The single cylinder engine, type 1 (see also Buffalo toy engine) and double cylinder type 2 model engine.

    (above) single cylinder type 1

    (above) Double cylinder type 2 engine dissasembled

    (above) side view.

  2. The type F power unit, with water cooling, for use in washing machines

  3. The type E ventilating fan

  4. The type D ventilating fan

    (above) Type D fan, 1912 price sheet.