a 5 B.H.P. and, like the smaller horizontal ones, is fitted with a vibrating governor and tube ignition.

All the engines dealt with hitherto have been engines in

which the cylinder has been either overhung from the main casting carrying the bearings, or supported with a foot; but in

figs. 36, 37, and 38 are seen engines in which the cylinders and main bearings are bolted to a flat frame; and it is claimed by the makers that a firmer grip upon the foundations is obtained

without overhanging the cylinders. The piston is unusually short, but is supported by a slide block connected to it by a rod.

valves are arranged as in figs. 31, 32, and 33, is fitted with a bent crank, and balanced by means of weights placed between the arms of the flywheels near the boss. Figs. 37 and 38 are

The crosshead pin and brasses, however, by this arrangement are easy to get at for adjustment. The 85 B.H.P. (fig. 36) has a cylinder 18 inches diameter and 24 inches stroke, in which the

FIGS. 37, 38.-400 B.H.P. STOCKPORT TANDEM ENGINE

an elevation and plan of a tandem engine, having cylinders 25 inches diameter and 36 inches stroke, which, when running at 120 revolutions per minute and working with coal gas of 16 candle-power, it is stated, will develop 400 B.H.P., and 330 B.H.P. when working with producer gas. It is, however, impossible to give any reliable data as to its B.H.P. or the gas consumed, as there are several other engines working from the same producer plant.

The cycle of operations in this engine is that shown in fig. 1 at B, and also in fig. 3-that is, an impulse every revolution when working at full power. The two pistons are connected by side rods supported at their ends by slide blocks, the connecting rod being common to both. The blow from the explosion of the charge delivered by the connecting rod at centre of cross-piece gives the latter severe bending, whilst the action