Mr Lutzman, which vehicle has been imported into this country by Messrs Julius Harvey & Co., a firm who have made motor cars one of their chief specialties.

Petter, Hill, & Boll's Oil Engine Road
Carriage.

The mechanism of Petter, Hill, & Boll's oil motor carriage is illustrated in Figs. 29 and 30. This carriage which is intended for two or four passengers, according to the gradients to be surmounted, is supported upon

four wheels, the rear or driving wheels being of comparatively large diameter, and the front wheels considerably smaller, and arranged for steering.

The motive power is supplied by an oil engine having a cast-iron cylinder 3 inches in diameter by 6 inches stroke, and fitted with a light steel cooling water jacket. This cylinder is bolted to two steel bars placed parallel to each other, and also supporting

FIG. 29.-Petter, Hill, & Boll's Oil Motor Carriage (Plan).

the main bearings, the weight of the engine fly-wheel and side bars being about I cwt. 8 lbs. The crank shaft is balanced and is recessed for oil. Rotary motion is transmitted from the crank shaft to a first or intermediate motion or transmission shaft by chain gearing and a friction clutch operated by a lever, which locks, when desired, the chain or sprocket wheel upon the said first motion or interinediate shaft. Motion is communicated from the latter shaft to the

driving axle by two sets of chain wheels and chains for different speeds, that for the slow speed being fitted with a ratchet box. Another lever admits of the operation of the change of speed being effected, and when the higher speed is in use the slow speed will, owing to the above-mentioned ratchet box, be enabled to overrun. The reverse movement of the starting lever, besides throwing the clutch out of gear and disengaging the first motion shaft from the engine, also applies the brake, which is more clearly shown in Fig. 30. arrangement of the above-mentioned parts, as also that of the steering, which latter is effected by means of a toothed quadrant and pinion, will be readily understood from the illustrations. The water and oil tanks are both located at the rear beneath the back seat.

The

FIG. 30.-Petter, Hill, & Boll's Starting Gear and Brake.

The weight of the carriage in running order, with supplies of water and oil, is about 9 cwt. With two passengers on board a speed of 10 miles an hour on level roads is said to be attainable, and any reasonably steep gradients to be easily surmountable. On level roads and slight gradients the carriage will readily carry four passengers.

Roger's (Benz) Oil Engine Road Carriages. The Roger carriage is a four-wheeled vehicle of the park phaeton type, which is also fitted with a Benz

gasoline motor.* It has wire wheels, and is adapted to accommodate two passengers.

A goods delivery waggon has also been designed by Roger, which is likewise fitted with a Benz motor, and is intended chiefly for city work. The engine used in the latter vehicle weighs about 5 cwt. 2 qrs., the waggon itself about 1 ton 2 qrs., and it has a carrying capacity of about 11 cwt. 2 qrs. It has sufficient storage capacity to contain a supply of rectified petroleum for a run of 75 miles.

Hertel's Oil Engine Road Carriage.

The Hertel carriage is a somewhat peculiar-looking vehicle, with a single seat adapted to accommodate two persons. It has a tubular frame, and is supported upon four cycle pattern wheels, running on ball bearings and having pneumatic tyres, the front wheels being 28 inches and the hind wheels 34 inches in diameter. The front wheels are each mounted in a fork, one of which latter is pivoted at either side of the fore part of the carriage, and the steering is effected by suitable levers connected with the said forks.

This carriage is propelled by a two-cylinder gasoline engine, and is very light, weighing only about 2 cwt. when in running order. There are, however, no special features in the oil motor employed calling for particular notice.

Haynes' (Sintz) Oil Engine Road Carriage. The Haynes carriage is also a single-seated one for two passengers. It is mounted upon four 28-inch

* See pages 91, 92 for description of this motor.

cycle pattern wheels, fitted with 1-inch solid indiarubber tyres.

Propulsion is effected by means of a 2 horse-power gasoline engine of the type made by the Sintz Gas Engine Company. The special features of this engine are as follows:-The gas and air are mixed in the lower or one end of the cylinder, which latter opens into a chamber containing the crank sweep, and the said explosive mixture of gas and air next passes to the closed upper or other end of the said cylinder by way of a port, which is opened as soon as the piston, which is of the plunger type, reaches the bottom of the stroke. The mixture is compressed during the upward or inward stroke of the piston into the clearance space above the latter, being exploded by an electric spark at the moment that the said piston reaches the termination of the said upward or inward stroke, and is about to descend. The gas generator or carburator contains about I pint of gasoline, the feed being regulated by an automatic needle valve. Motive power is transmitted from the engine crank shaft to an intermediate transmission or motor shaft by means of sprocket or chain wheels and pitch chains, and from this intermediate transmission shaft to the rear or driving wheels by other sprocket or chain wheels and pitch chains.

The weight of this carriage in running order is about 9 cwt. 1 qr., and the highest speed attainable is stated to be about 10 miles an hour. One charge of gasoline (I pint) will enable about 50 miles to be run at ordinary speed.

A larger carriage of the same type, adapted to seat four persons, has 36-inch cycle pattern wheels, having

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