auxiliary engine
donkey engine

An auxiliary engine was used to power the millstones until the mid-1930s.

Each had two auxiliary engines driving a paddle wheel, one either side of the ship.

This seemed good advice, so the auxiliary engine was started and the winches began turning slowly.

When we were within about 50 yards of it, I shut off the auxiliary engines.

The seven-cylinder auxiliary engine was brought back to life in 1975.

Unlike many other previous electric cars, the Impact does not have an auxiliary gasoline-powered engine.

But I wouldn't have one without an auxiliary engine.

The generator ran on water power, and Jake had made sure that there was no auxiliary engine for it.

The auxiliary engine increases the car's range to 150 miles.

"Not if we get far enough ahead of him," I said, reaching to switch the auxiliary engine back on.