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supported on the auxiliary gear case from which they are driven by means of serrated couplings. Incorporated in the latter is a de-vice for enabling a fine and positive adjustment of the ignition timing to be effected. Two spark plugs or approved made are fit-ted to each cylinder.

WATER CIRCULATING PUMP AND COOLING SYSTEM.
A centrifugal water circulating pump of ample capacity is fitted below the bottom half crankcase being driven from the auxiliary shaft through skew gears.
All water pipe connections consist of rubber joints with a special patented type of clip, allowing of ample flexibility.

OIL PUMPS AND LUBRICATING SYSTEM.
The lubrication of the engine is on the "dry sump" sys-tem, the bulk of the oil being carried in a service tank separate from the engine. Two "scavenger" pumps and one "pressure" pump are arranged on the bottom of the lower half crankcase, being driv-en from the auxiliary shaft. The "scavenger" pumps draw oil from the crankcase and deliver it to the service tank and the "pressure" pump takes it supply from the service tank and delivers it to the

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