Trials of Self-binding Reapers at Aighurth. 
139 
level, and the suction-pipe is either to be taken down to a tank not more than 
I eight or nine feet below the level of the flange Q, or it may be connected 
with a tank at any height above the apparatus. When fixed, the instrument 
is to be filled with water by unscrewing the plug in the air-chamber G, 
and is then ready to be started. On admitting steam through the steam- 
neck J, by opening the wheel-valve above it, the steam will depress the 
water in the chamber open to the steam, forcing it through the delivery- 
valve. On reaching, however, the centre of the discharge-opening leading to 
the discharge-box, owing to a particular configuration of the passage, the 
steam is instantly condensed. The steam-ball, pulled on one side by the 
partial vacuum, and also assisted by the vapour and water in the other 
chamber, changes its position in its seat, sealing the opening in the neck 
through which steam had been previously passing, and a tolerably perfect 
vacuum is then formed, and the water then rushes up through the suction- 
valves to fill the void. In the meantime the action in the other chamber 
is exactly similar to that just described, these alternate changes going on 
steadily as long as steam and water are supplied. 
Beyond the foregoing descriptive remarks no further observa- 
tions are necessary from me, as the Judges were favoured with 
a special Report on this machine from Messrs. Eastons and 
Anderson, the Society's Consulting Engineers. They report as 
follows : — 
Article 4361, Stand 205. Hydrotrophe or apparatus for feeding boilers. 
This instrument is a variety of the pulsometer, which was first exhibited last 
year and found on the trial not to be an economical method of raising water. 
As applied to feeding boilers, however, the question of economy does not 
' arise, because the whole of the steam used is returned to the boiler ; there 
cannot, therefore, be any considerable loss of heat. The instrument, now 
exhibited for the first time, is said to be for 30 horse-power boilers. We 
have found by experiment that it will pump as little as 1'89 gallons per 
I minute at ten pulsations, equivalent to IS horse-power, and as much as 
6'21 gallons per minute at 29 pulsations, which is equivalent to 60 horse- 
power ; the range of the apparatus is therefore considerable. We ascertained 
further that it will work steadily with feed-water up to 140° temperature, 
and that there is no difiiculty in stopping and starting the instrument. It 
has one defect in common with the Gifford injector, and that is, that it will 
not suck water more than 8 feet high ; in the present instance it was not 
more than 5 feet above the level of the water in the supply-tank. It must 
! be placed near the water-level of the boiler, and the higher it is above, the 
I more water it will dehver within the limits of the apparatus. The price is 
16/., which is moderate, and there is no difficulty in fixing. We think the 
hydrotrophe will prove a useful and durable pump applicable wherever 
independent feed-pumps are required, and where water can be obtained 
within 8 feet of the water-level of the boiler to be fed. 
Eastons and Anderson. 
The third and remaining silver medal was awarded to Messrs. 
Clayton and Shuttleworth's new patent Drum-guard on a 
I Threshing-Machine. This adaptation fills up a want long 
felt. It is a machine purely agricultural, which is a distinctive 
feature of merit to be duly considered when it comes before the 
Judges of the Royal Agricultural Society. To the farmer and 
