change gears

But all the answer they got was, an emphatic "Don't change gears as if you were running a thrashing machine, Mac."

Two different speeds for the cylinder can be obtained by means of change gears.

A set of change gears can easily be engaged to give a fast motion to the carriage.

"If only I remember to let out my clutch before I change gears," Mollie murmured.

The change gears that will give the required spindle speeds should first be selected.