742 Report on the Exhibition of Implements, 
" Duration of test, one hour. 
" The whole of the steam generated had to pass through the valve, and the 
following is the result : — 
" On the gauge showing 60 lbs. the valve went o£f. The gauge instantly 
started to go gradually back to 59'4 lbs., when the valve closed tight; the 
time occupied being 13 seconds, and the mean difference between the greatest 
and least pressures being 0*6 of a pound. (There being no accumulation 
whatever.) 
" The valve repeated this cycle of operations during the hour's test with 
unvarying regularity of pressure and time. 
" The time was taken simultaneously by all the arbitrators from a 15-inch 
diameter dial clock fixed on the wall, having a second-hand moving round its 
periphery, and they were unanimous in awarding the prize to ' Vena Contracta,' 
which has since been claimed as the valve of Mr. Thomas Adams, of Manchester." 
A boiler was under steam during the Show, fitted with one of 
these valves, in which the pressure was very uniform, a quarter 
of a pound excessive pressure at once opening the valve, which 
closed promptly as soon as the pressure had fallen a quarter of a 
pound below the point at which the valve was set to blow off. 
Although unnoticed by the Judges, I have been requested by 
them and the Stewards to draw attention to the hurdles made 
Fig. 35. — Junction of Bottom Bail Fig. 36. — Junction of Top Hail 
with Upright. with Upright. 
by Messrs. William Glover and Sons, of the Eagle Works, 
Warwick, which were designed by the Society's Surveyor, as an 
improvement on those used for the exhibition of sheep and pigs 
in connection with the Paris Universal Exhibition last year, and 
which were employed with such manifest advantage for the pig- 
pens at Kilburn. Though readily removable, they make, when 
properly fixed, a very strong inclosure. They are light in appear- 
ance, and provide abundant ventilation. The simplicity of the 
gates fixed in the centre of each 9-feet hurdle, and their perfect 
efficiency, are very noteworthy. 
