1851 Great Exhibition: Official Catalogue: Class V.: William McNaught
22. MCNAUGHT, WILLIAM, 26 Robertson Street, Glasgow — Inventor.
Patent double-cylinder steam-engine; a modification of "Woolf's double-cylinder engine," in which steam is admitted at a high-pressure into a small cylinder, from which it passes into a larger one, where it expands, and whence it finally escapes into the condenser. The present arrangement is designed to admit of the application of high-pressure steam, and the expansive principle, to engines originally constructed for working low-pressure steam. This is effected by placing the high-pressure cylinder at one end of the beam, and the low-pressure cylinder at the other. Power being thus applied at the two ends of the beam neutralizes the strain upon the main centre, and removes the cause of the shaking of the machinery and building, experienced in ordinary beam engines when heavily loaded. In the example exhibited, the arrangement is adapted for marine-engines, and offers the means of obtaining increased power in a limited space, with equable motion and strain.
Montgomery's self-acting break for railway carriages. To the axle of each carriage is attached a break, acted on by a spring - the shackle of each carriage is fixed to this spring, so that when the tractive power is withdrawn, the pressure of the breaks is applied.
[Note: The last paragraph appears to belong to this company - it is not clear from the book. - Editor]