Parkinson and Crossley's Air Motive Engine

Source: The Engineer's and Mechanic's Encyclopedia, comprehending practical illustrations of the machinery and processes employed in every description of manufacuture of the British Empire - Vol. I, Page 42
Date: 1836
Title: Air-Motive Engines
Author: Luke Hebert

Luke Hebert participated to the edition of Galloway's book. His description of the engine is word for word the one of Galloway (text can be found here). It won't be reproduced here. Only his commnents and pictures are presented.

In 1828, Messrs. Parkinson and Crossley took out a patent for an air-engine, which differs considerably in the arrangement of its parts from the one just described The Stirling engine; and as it appears to be of a somewhat simpler construction, we shall lay a description of it before our readers.

Parkinson and Crossley's Air Motive Engine - Fig. 1

Parkinson and Crossley's Air Motive Engine - Fig. 2

Parkinson and Crossley's Air Motive Engine - Fig. 3

We are not aware that the engine just described has been brought into practical operation, but that invented by Mr. Stirling was employed in a stone quarry ; it has, however, we learn, been replaced by a steam-engine, in consequence of its inferiority to the latter in the economy of working, particularly as respects the consumption of fuel.

One objection to air engines is, that the changes of volume do not take place with sufficient rapidity, and that when water is employed to accelerate such changes, the quantity necessary for that purpose is greater than would be required to supply the boiler of a high- pressure steam-engine; so that in situations where either water is scarce, or the weight of it an objection, the latter engines would, on those accounts, be found superior to the former.