THE DISTRIBUTER.--This tank is connected with a distributer, which controls the pressure flow to the different cylinders. In Fig. 91 the distributer would send this pressure to cylinder No. 1. The opening of a valve readily accomplishes this, and if the charge in No. 4 should not explode, the next in order to get the compressed gas from the tank, would be cylinder 4, which would bring cylinder 3 into position for firing. As soon as ignition takes place, the driver merely shuts off the valve, and no further attention is required to operate it. LIGHTING.--Most cars depend for illumination on the use of compressed gas usually, some form of acetylene, which makes a brilliant light, and is not expensive. The best cars, however, are also equipped with electricity, some depending on storage batteries, and others on current generated on the car itself. There is nothing in either system that requires any special explanation, nor are they difficult to care for and operate. SIGNALING.--It has been the custom for drivers, in approaching corners, or street intersections, to hold out the right hand as a sign that a turn is to be made to the right, or the left hand for a turn in the other direction. CAR SIGNALS.--Numerous devices are now on the market designed to be located both in front and in rear of the vehicle, which are intended to indicate direction, as well as to impart other information. These signals are under control of the driver, and have signs on them which indicate “_stop_,” “_right_,” “_left_,” or other words which conspicuously display the intention of the driver. All machines have signaling horns of some character, operated, usually, by some mechanical arrangement connected with the gearing or by compressed air, and others are connected up with the engine exhaust. Chime whistles are so operated. SPEED SIGNALS.--Other inventions are designed to indicate, by automatic mechanism, the speed of the car, in which color displays the relative speed. Thus, a car going at the normal speed, say 10 miles per hour, would show a white light; from 10 to 15 miles, blue; from 15 to 20 miles, green; and above that speed, red. The foregoing colors and speeds are arbitrarily selected, merely to show the ideas involved. The device in question has nothing whatever to do with the regular speed registering mechanism of the car, but is designed to show pedestrians and police officials the actual running speed at a glance. MUFFLERS.--There is really no excuse for noisy automobiles. Mufflers are now made which absolutely eliminate all noise from the exhaust. The great difficulty in the past has been to make them sufficiently large for the engine. If too small they do not take care of the exhaust properly, and they also serve to check the flow of the exhaust gases from the engine, and thus greatly decrease the power of the engine. EXHAUST.--All racing engines are made without exhausts, so there will be nothing to retard the flow of the exhaust.