ExJiibiled at WindaOr' 
541 
hoUoW casfc-iron base plate, in the body of which a small trough 
or tank for the petroleum is fixed. On the main crank-shaft is 
a small pinion, gearing into another on a counter-shaft in front 
of the engine. On this shaft there are three cam-plates — one 
actuating the main slide of the engine ; the second the inlet 
vapour valve and the pump, the stroke of which is also con- 
trolled by the governor ; and the third cam-plate actuates the 
exhaust valve. At the rear of the cylinder is a heating chamber, 
which, before starting the engine, is heated up by an ordinary 
mineral-oil lamp. In starting the engine, it is first necessary 
to pump by hand a small quantity of petroleum into the chamber 
actuating the pump. Ignition is effected by a blast flame from 
a petroleum lamp, which heats a small coil of platinum wire fixed 
in the opening of the slide valve. The blast for this flame is 
obtained by a bellows worked direct from the crank-shaft of the 
engine. A trial of this engine was made, with the following 
results : — 
Duration of trial 3 h. Ti m. 
Brake horse-power 0-544 
Consumption of petroleum during trial . . . 5-94 lbs. 
„ „ per brake horse-power 
per hour . . . 3'54 „ 
During the early part of the trial the engine ran very 
irregularly indeed, the weights on the brake having frequently 
to be relieved, in order to prevent the engine pulling up. The 
engine was not in a sufficiently developed state, and to perfect 
it considerable reduction must be made in the consumption of 
petroleum. The ignition is imperfect, and the exhaust is not 
sufficiently free, the noise from it being most objectionable. 
The Farmers' Foundrij Company, of Ryburgh, Norfolk, showed 
a Sheep Folding Hurdle (Art. 5277), strong and well-made, and 
very easily moved in any direction, being mounted on patent 
swivel wheels, which act in a similar manner to the castors on a 
chair. 
The Harden Star Lewis & Sinclair Company, of Cannon 
Street, London, exhibited (Art. 5516) Muirhead's Patent Auto- 
matic Water Supply and Flushing Apparatus for horse and 
cattle troughs, which has been extensively used in Glasgow for 
the troughs in the city. It is said to give all the advantage of 
a constant run of water without unnecessarily wasting any, and, 
by flushing away in an ingenious manner any mucous or other 
matter left by the animals after drinking, to keep the troughs 
filled with clean water, and thus prevent the spreading of disease 
amongst the animals. 
Messrs. Eddington & Steevenson, of Chelmsford, also exhi- 
VOL. XXV.— S. S. N N 
