Patent Air Engine, by Messrs. Parkinson and Crossley, of the City Road, London 1828
This invention is another modification of machinery for rendering available to useful purposes the elastic force of air, in the construction of a motive engine. We have seen two models of these air engines at work, in which two distinct arrangements of the apparatus are introduced. The operations of heating and cooling the air are performed so rapidly by them, as to cause one hundred and fifty strokes of the piston in a single engine to be made per minute. The patentees not having yet completed their experiments on the large scale, we shall at present confine our attention to the specification of their patent lately enrolled, from which we make the following abridged extracts.