34 Report on Miscellaneous Implements at Shrewsbury, Sfc. 
There is no valve chest, however, the cylinder with its valve being directly 
surrounded by the boiler steam, while a throttle valve placed on the exhaust 
affords the means of stopping and starting. Of course the cylinder is by this 
arrangement most effectively steam-jacketed. The piston is coupled by a 
connecting rod in the us\ial way to a crankshaft supported by bearings which 
are mounted on brackets cast in one with the boiler, as shown. The crank- 
Pig. 12. — Longitudinal Section of Messrs. Haicthom, Davey and Co.'s 
Domestic Motor. 
shaft is provided with an eccentric for actuating the slide valve in the usual 
way, while at one end it carries a flywheel and at the other a disc crank for 
driving the air-pump. When the engine is u.sed for pumping purposes, the 
pump is mounted on the bed-plate and driven from a craiik-pin in the fly- 
wheel. 
By the side of the boiler is another casting, forming the condenser, the 
feed-chamber, and the hot-well. In the connection between the cylinder 
and the condenser is fltted the throttle valve we have already referred to. 
The condenser is provided with an ordinary jet injector. The air-pump is 
single-acting and is fitted with a plunger, not having any packing. When 
