TRANSACTIONS OF THE SECTIONS. 213 
On Safety- Valves for Steam Boilers. By Mr. Guturne. 
The author endeavoured to prove that the safety-valves at present 
in use are not large enough, and proposed a construction of boiler and 
valve, such that the whole top of the boiler should in fact be constituted 
a safety-valve. 
On a Gas Regulator. By Mr. James MItne. 
By means of this invention the length of the flames is equalized, 
notwithstanding the variations of pressure that occur, and a consider- 
able saving in the consumption of gas is effected. 
Mr. Alexander gave an explanation of his Electro-Magnetic Tele- 
graph. 
Mr. Dunn explained “ Ponton’s Electro-Magnetic Telegraph,” which 
instrument was exhibited in the model-room. 
On a New Hydraulic Apparatus. By Mr. Jer¥rey. 
It comprised an improvement on the ancient endless chain of 
buckets, which the author considers of Egyptian origin. This appa- 
ratus has hitherto never acquired the value it admits of, on account of 
a defect having remained in its construction, opposed to geometrical 
principle—the buckets which bring up the water being fixed outside 
instead of within the rope. The effect of this is such an acceleration 
of the bucket, when it is carried round the wheel at top, as causes it to 
overtake the water and carry much of it down again. But by placing 
the buckets on the centre side of the ropes, that is, within them, the 
bucket when passing round the wheel, being very near the centre, is 
much retarded, and the momentum of the water causes it to ride out of 
the bucket very effectually into the trough. A peculiarity in the form 
of the bucket also prevents the spilling of the water in cases where the 
motion is very slow. 
Mr. Jeffreys described a fire-grate, exhibited in the model-room, 
which may be placed, he said, so far forwards as to be quite out of the 
chimney, and radiate a two-fold quantity of heat into the apartment, 
and yet there shall be no tendency to send smoke into the room. By 
an addition, in accordance with the same principle, fresh air is intro- 
duced, comfortably warmed before it enters the room. - 
Mr. Fairbairn described “ Hall’s Patent Hydraulic Belt for Raising 
Water.” 
