William Murdock's Locomotive, 1784.


This cut shows a longitudinal section of a miniature locomotive, made by William Murdock in 1784. It had a single vertical cylinder _" dia. by 2" stroke, the slide valve was actuated by a tappet motion, the beam striking it up and down alternately at each end of the stroke, the piston rod was connected to one end of a beam vibrating upon a joint at the other, as in the class of engines now known as "grasshoppers." A connecting rod was joined to the beam, close to its working end, and turned a crank in the axle of a pair of driving wheels 9_" dia. The cylinder was half immersed in a small copper boiler, through which a flue passed obliquely, the heat being supplied by a spirit lamp beneath. This machine is still in existence and is the property of Mr. Murdock, manager of the Sun Foundry, Leeds and grandson of William Murdock.

A further description of Murdoch's’s engine is given in A History Of The Growth Of The Steam-Engine by Robert H. Thurston.