1851 Great Exhibition: Official Catalogue: Class IX.: James Usher

Usher's Locomotive Steam Plough

123A USHER, JAMES, Edinburgh — Inventor.

Model of patent locomotive steam-plough. The novelty consists in reversing the action of the ploughs, and making them rotatory. The ploughs revolving behind the carriage act as propellers. This model is represented in the cut.

A b are the front wheels, which are turned on a pivot by a rack and screw; B e are a series of revolving ploughs behind the engine, which, while at work, propel the car- carriage; C y is a spur-wheel, driven by pinion P, which gives motion to the ploughs; D i is a frame which is moved up and down by the rack, l m, by means of which the ploughs are elevated or depressed at pleasure.

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