William Otis receives a patent for the…
February 1839 CE
The first machines are known as 'partial-swing', since the boom cannot rotate through 360 degrees.
They are built on a railway chassis, on which the boiler and movement engines are mounted.
The shovel arm and driving engines are mounted at one end of the chassis, which accounts for the limited swing.
Bogies with flanged wheels are fitted, and power is taken to the wheels by a chain drive to the axles.
Temporary rail tracks are laid by workers where the shovel is expected to work, and repositioned as required.
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