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1896 CRASTIN'S OIL MOTOR QUADRICYCLE 
The oil motor quadricycle illustrated by the accompanying engravings, and made by Mr. P. Crastin, Holloway, is actuated by a motor somewhat novel in construction.
A long steel tube, fitting tightly into castings at either end, forms the cylinder and cylinder ends, and means of holding the cover and valve fittings. The tube is slotted in the centre of its length, and is fitted with an inner tube, the ends of which are stopped, and thus forms a double-ended piston. Oil vapour from a small simple vaporiser, with sight drop-feed, is taken alternately into the one and the other end of the cylinder, and thus, although the motor works on the Otto cycle, it gives an impulse for every revolution.
The side view herewith shows the two ends of the cylinder, with the intervening tube and the forked connecting-rod engaging with a crank, which is more clearly seen in the end view. The cylinder ends are jacketed, and water circulates through them and two connecting tubes.
The first speed reduction from that of the crank shaft is taken from the valve driving spindle, which runs at half the speed of the engine, and the remaining reduction is obtained by the gearing shown. The diameter of the cylinder is 1.75in. and the stroke 4in.