454 Report on the Trials of Implements at Oxford. 
allowing some portion of the water pumped to pass back into the tank or 
well. There is an Argand blast-pipe, of 2j inches diameter, with cone inside, 
to adjust the opening, and used at a diameter of If inches, level with the top 
of the blast-pipe, equal therefore to width of opening all round. Fire-box 
1 foot G inches fore-and-aft, 2 feet 1 inch wide. Bars running fore-and-aft, 
4i inches wide ; bars | to 1 inch, spaces i to f ths. Boiler provided with mud- 
hole doors, blow-off cock, glass gauge, two gauge cocks, and small blow-pipe 
to chimney. Large lubricator to cylinder. Total length over all, except 
cocks, 9 feet 5 inches. Width of fire-box outside, 2 feet 8 inches. Feed- 
water heater projects 6 inches. Fly-wheel projects 8 inches beyond the 
2 feet 8 inches width, and about 4 inches beyond the end of the boiler. Good 
fly-wheel and balance weight. Total weight, with wheels, 3 tons. Fire-box 
stands in a space of Si feet by 6 feet in width. 
No. 9. Hancock and Foden, 6966. Upright boiler with engine attached. 
Cylinder at top. Working slide and expansion slide, not adjustable except 
by altering the key on wrought-iron crank shaft. Cylinder 7 inches diameter ; 
12 inches stroke ; 120 revolutions per minute. Governor is fixed to cylinder 
with driving strap and bevilled wheels. Pump driven by seimrate eccentric. 
Four guide bars to piston-rod. No drum on crank shaft ; and fly-wheel 
without balance weight, and engine somewhat unsteady in working in con- 
sequence. Feed-water heated by condensed water and steam from eduction 
steam-pipe. Water may have to be lifted 18 inches. The jmmp is kept full, 
as the excess feed-water pumped is allowed to pass back into the feed water 
heater. The cylinder not steam-jacketed. One cross tube through the fire- 
box, and a baffling plate just below the upright chimney flue, prevents the 
produce of combustion going straight up the chimney before it has come in 
contact with the crown of the box. Fire-box, 2 feet 3 inches diameter, 3 feet 
7 inches high. Shell of boiler, 2 feet 10 inches diameter, 6 feet 6 inches high. 
Fire-bars, -f-gths thick, y%ths spaces. A bar of brickwork, 9 inches wide, runs 
fore-and-aft from the fire-door. Boiler provided with mud-hole door. Mud- 
hole doors to feed-water heater. Boiler covered and lagged with sheet-iron. 
Base 3 feet 11 inches by 4 feet. Chimney 4 feet high. Fly-wheel projects 
sideways 44 inches, and at end about 2 feet 4 inches. Weight about 2 tons 
12 cwt. 
No. 10. Marshall, Sons, and Co. (Limited), 7081 . Upright boiler with tubes 
hanging down towards fire, much like Robey's, described before, inclosed in 
strong boiler-plate casing. Engine nearly vertical ; cylinder at top. Fouv 
guide-bars to piston. Working slide, and expansion slide driven by separate 
eccentric, capable of adjustment by bolt, nut, and slot. Steam cut off at 
3 inches. Feed-pump placed low down in the tank, so that it can pump 
boiling water. Feed-water beater has copper tubes, with a particularly large 
amount of surface. Cylinder steam-jacketed, sides, top, and bottom, and 
lagged, and inclosed in sheet-iron case. Wrought-iron crank shaft. No 
drum. Fly-wheel without balance-weight. Boiler provided with 2 glass 
gauges, mud-hole doors, and small blow-off cock. The quantity of steam 
passing through feed-water heater can be adjusted by cock. The tank, of 
wrought iron, under the engine forms water-tank and ashpan. The governor, 
placed at top, is driven by strap and bevilled wheels. Both jjlummer-blocks 
and crank shaft carry large brasses, with wrought-iron plate riveted to boiler. 
Chimney, 7 feet high, 9j inches diameter, lioiler, 2 feet 7 inches diameter, 
by 7 feet. Base, 3 feet 10 inches by 6 feet. Fly-wheel projects about 
6 inches at the side, and 6 at the end. Works very steadily. 
No. 12. Heading iron Works (Limited), 4009. — Horizontal boiler, 31 tubes, 
2i in. in diameter outside, .5 feet 6 inches long, cylinder horizontal on top of fire- 
box, 5| inches diameter, 14 inches stroke, 140 revolutions per minute. Sup- 
plied with working slide and expansion slide, with separate eccentric, capable of 
