On the same central pin as c is the pinion d driving a spur gear e′′.
The magnetos are very accessibly located on a bracket on the spur gear cover.
There are two spur gear changes, either of which may be used and which give a very wide range.
In electric cranes the motor is connected to the barrel, either in a similar manner by spur gear or by worm gear.
The boiler was of cast-iron, with a one-cylinder engine, spur gear and a fly-wheel on one side.
Now a spur gear, as well as a pinion, has three diameters; one measurep.
The makers claim that lost motion can be taken up in a bevel gear much better than in a spur gear.