A mechanical appliance giving a rotary motion to a dentist's boring instruments.

plural of pony engine

A small engine used for shunting wagons, etc.

The branch of engineering that is applied to mining.

plural of atmospheric engine

A kind of steam engine in which the steam is admitted only to the underside of the piston.

plural of harmonic engine

(historical) A machine in which the energy of an electric current is used, by means of two small electromagnets, to keep up the vibrations of a large and heavily-weighted tuning fork whose arms are connected to two pistons working a miniature pump.

A blue paste made from Prussian blue and some oily substance, used to verify the mating of components by rubbing a coated workpiece against the target surface to leave marks.

(rail transport, UK) A principle in railway signalling where only one train or locomotive is allowed to run on a section of single-track line, such as a branch line, at any one time.