'Sea-going launch for the Political Agent, Bahrain. Corr. re: Kelvin Engine.' [‎1dr] (9/398)

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^CONNECTING RODS.—Of steel H. Section—very light. Big ends lined with white
Ikietal. Bolts of Nickel steel.
VALVE GEAR.—Inlet and exhaust valves are vertical in the head and operated by
rockers of hardened steel mounted on roller bearings—all enclosed by an oil-tight cover
easily removed. The rockers are operated by vertical push rods encased in brass pipes.
The camshaft is within the crankcase, well lubricated, and driven by gear wheels within
an oil-tight case. The cams are integral with the shaft.
CRANKSHAFTS.—Of Nickel steel—very hard—with crankpins hollow to reduce
unbalanced weight. All models have balance weights. The one and two cylinder models
create no more vibration than the four cylinder model.
BEARINGS.—The crankshaft has a bearing between each cylinder and two bearings
between the front cylinder and the flywheel. All the bearings are adjustable through the
inspection doors.
i
CRANKCASE.—In one piece with inspection doors on both sides giving access to everv
internal part; white enamelled inside.
FLYWHEEL.—Fixed by large flange and bolts, balanced and of ample weight for
running slow. Flywheel pan to protect flywheel from bilge water.
EXHAUST MANIFOLD.—Water cooled with cleaning door each end.
SILENCER.—Of our well-known pattern in which the circulating water and the
exhaust gases mix together—discharge almost inaudible—silencer and exhaust pipe
never more than hand hot. This silencer must be above sea level. For deep boats a
standpipe to raise it is furnished without extra charge.
EXHAUST PIPE.—The sulphur contained in Diesel fuel causes rapid corrosion of copper
or iron. The exhaust pipe is, therefore, of material which resists this corrosion.
WATER PUMP.—Of gunmetal with a single cotton-packed ram, chromium plated—
sand resisting. Valves of brass all immediately accessible.
STRAINER.—Combined with the seacock is a strainer of Monel Metal which may be
cleared from inboard without stopping the engine.
CRANKCASE PUMP.—For emptying the crankcase a hand pump is fixed in a con
venient position.
STARTING HANDLE.—At rear end with revolving brass grip ; safety device to prevent
back-kick when engine stops.
REVERSE GEAR.—Attached direct to the engine—permanent in alignment. The
ahead clutch is double, the astern clutch single. Both of cast iron. The thrust, both ahead
and astern, is taken on ball bearings situated within the case. The case is white enamelled
inside and oil tight. The control is by gunmetal hand wheel.
TANKS. Two types may be supplied. The horizontal tank is more suitable for
shallow boats, but the vertical type is the better tank, and is recommended when it can
be accommodated. The horizontal tanks are galvanized in and out. The vertical
tanks are internally coated with white enamel.
EQUIPMENT.—Propeller of bronze and balanced. Sterntube of naval brass with out
side stuffing box to exclude sand. Shaft bearings of gunmetal split for adjustment. All
hull connections of gunmetal. All pipes of corrosion resisting metal. Tool outfit very
complete (see page 653).
SCREW THREADS.—The British Standard Fine Thread is used throughout (except
~ for pipes) in preference to the Whitworth thread, now out-of-date except for rough work.
Wy Small screws and studs are of rustless material.
vs INSTALLATION WORK.—If a plan of the vessel is furnished, the equipment will be
made to suit whereby the work of installation is brought within the capacity of a carpenter
with his ordinary tools.