TRANSACTIONS OF SECTION G. 657 
was, he contended, none the less applicable to towns where the ‘combined system ’ of 
drainage was in operation, and which might, on that account, be preferred to the 
‘separate system,’ because by the employment of his hydraulic sewage-ejectors 
fixed at the houses and heads of sewers, and by the employment of his pneumatic 
sewage-ejectors, distributed over the town to be drained, suitable house-drains and 
public sewers could always be laid at such gradients as would cause the sewage 
flowing into them to flow through them at ‘self-cleansing velocities,’ a condition 
which if invariably insisted upon would result in the practical extinction of 
offensive and dangerous sewage-gas emanations. 
5. On the Rosebridge Colliery Deep Mine and the Winding Machinery 
Employed. By G. H. Dacusu, M.Inst.C.B. 
In briefly giving the history of this colliery the author states that the shaft 
passed through the Ince, Furnace, Pemberton, and Wigan mines, including ten 
distinct sections, before striking cannel, which was done in 1862, after two years’ 
working. 
Temperatures were taken at intervals during the sinking of the shaft, and they 
were found to be as follows :— 
At a depth of 558 yards, 78° Fahr. 
30 83° 
” ” ” 
if a7 Ser, 
SAN RRL w DOES 
of SOOT ete Dor —%, 
” 806 ” 934° ty] 
ss Slory A O4ey 
As an instance of the extraordinary work performed by the winding engines, 
it is mentioned that 1,976 tubs of coal, of 74 cwt., were raised in a day of ten 
hours. 
In 1868 the shaft was extended down to the Arley mine at a depth of 806 
yards, very little water, which was salt, being found at this depth. It was then 
found necessary to increase the winding drum to a diameter of 24 feet, and the tail 
ends of the piston rods were cut off, thus saving friction. 
The mean speed of the cage in the shaft is 2,590 feet per minute, and the 
maximum 5,100 feet, or about fifty-eight miles per hour. This is considered the 
quickest in England, and until recently the mine was the deepest. 
6. The proposed Jordan Canal. By Trurawney Saunvers, F.R.G.S. 
WEDNESDAY, SEPTEMBER 26. 
The following Papers were read :— 
1. The British Navy. By Captain Beprorn Pinu, R.N., F.B.G.S. 
2. On a Self-Registering Ship’s Compass. Dy Ropery PickWELL. 
The wooden stand, lashed and screwed to the deck, which carries the ordinary 
howl, is covered by the binnacle top with glass windows, the stand being of any con- 
venient height. Inside the outer bowl the compass bowl is hung on gimball rings 
in the usual way, and the compass card is below the glass cover or lid of the inner 
1883. UU 
