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M is a Siemens electric motor running at 650 revolutions per minute; E is a combination of box gearing, frictional clutch, and chain pinion, and from this pinion a steel chain passes around the chain-wheel, H, which is free to revolve upon the axle, and carries within it the differential pinion, gearing with the bevel-wheel, B², keyed upon the sleeve of the loose tram-wheel, T², and with the bevel-wheel, B¹, keyed upon the axle, to which the other tram-wheel, T¹, is attached.
The huge cylinders drove upwards with a double crank to carry their motion to the screw; and I found that the difficulty of starting and reversing was overcome by an intermediate bevel-wheel gearing and friction clutch, which could throw the motion off the shaft, and allow that instantaneous going astern otherwise impossible in a gas-engine.
Near the end is fixed a horizontal bevel-wheel, engaging with a vertical bevel of equal size and number of teeth attached to a short rod running through a hole in the post to an arrow on the other side. Between arrow and post is room for a dial on which the points of the compass are marked. The construction of the apparatus is so simple as to call for little comment.
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