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Many authorities, in fact, declare that the rotary engine is the aeroplane motor of the future.

A brief description of the motor here will suffice to show the general principle of the rotary engine.

The gyroscopic action of a rotary engine will affect the longitudinal stability when an aeroplane is turned to right or left.

It is a small monoplane, with a French rotary engine in front; it is about half as large as a Taube.

It has recently become common to construct the steam fire-engine with rotary engine and pump (Fig. 122).

These advantages adapt the rotary engine, in an especial manner, to the driving of a locomotive or steam fire-engine.

The pump used with this engine is, as shown in the above illustration, somewhat similar to the rotary engine driving it.

Watt invented a rotary engine, and Yule many years afterward constructed such engines at Glasgow.

When the rotary engine was finished, the partners sought to obtain a charter, when lo!

The latter patent, curiously enough, comprised a very primitive form of rotary engine.