and has been very widely applied, especially in marine servi It was used on many of the early forms of automobiles but 1 been displaced by improved forms. The amount of fuel drawn in the mixture is altered by a needle valve located at the bottom the carburetor and which regulates the size of the spraying orifi The auxiliary air supply is controlled by a leather valve wh is kept seated by a coil spring having a tension regulating ser to limit the valve opening. As the tension of the spring is creased, the valve opens less owing to the augmented resistance the spring. When the spring tension is reduced the air valve w open wider and allow more auxiliary air to flow into the mixtu It will be noted in both of the carburetors shown at Fig. 194, t the primary or main air opening is not variable. This is set to c tain proportions determined by experiment when designing carburetor.

Overland-Schebler.-The device outlined at Fig. 195, is of the most recent developments of the Schebler carburetor and the form used on some models of Overland cars. The inter construction is clearly shown at A in the sectional view, while external parts are plainly outlined at B. The instructions regulating this carburetor are as follows: First, seat the nee valve, which is indicated as A in the sectional view, by turni the adjusting screw to the right until it stops. Do not use pressi on the screw after it meets with resistance. Then turn it to left about a turn and a half and prime or flood the carburetor pulling on the priming lever and holding it for about five secon Open the throttle by moving the throttle control lever about t thirds across the quadrant. Start the motor, then close the throt slightly, retard the spark, and adjust the needle valve adjusti screw in and out until the motor runs at the desired speed a hits regularly on all four cylinders. When a good adjustm has been secured for low speed with the motor running idle not alter the needle valve adjustment any more, but make intermediate speed and high speed adjustments on the dials shov First adjust the pointer on the intermediate speed dial movi from the figure 1 towards the numeral 3, and setting it about h way between. Now advance the spark lever and open the throt

so the roller running on the track below the dial is in line wi the intermediate speed adjustment dial. If the motor backfir with the throttle in this position, and the spark advanced increa the gas supply by turning the indicator a little more toward the on the dial, or if the mixture is too rich, cut down the gas supp by turning the indicator back towards the numeral 1 on the di until satisfied that the motor is running steadily at the intermedia position of the throttle. Finally, open the throttle wide and mai the adjustment with the high speed dial for high speeds in t same manner as you have made the adjustment for the intermedia speed. In adjusting the carburetor by this method there is a te dency to give too rich a mixture. Therefore it is advisable whe making these adjustments to cut down the gasoline needle un the motor begins to misfire, and then to increase the fuel supp gradually until the motor hits evenly on all four cylinders. T auxiliary air valve regulating screw should also be adjusted order to secure the best valve openings for high motor speeds wi the wide opened throttle. For average running a mixture lea in gasoline will give more power and greater speed than a ri mixture, but it will be harder to start the motor than if the rich mixture is employed.

Breeze. The Breeze carburetor, which is shown at Fig. 196, of a conventional pattern having mixture proportion regulati by needle valve adjustment for controlling the fuel supply a auxiliary air valve springs tension adjustment for varying t air admitted. The needle valve is controlled by an adjustme screw at the side of the carburetor in one type which is unscrew to permit the needle valve to rise out of the spray nozzle a screwed in to depress it into the spray nozzle opening and c down on the amount of gasoline sucked into the mixture. It w be noted that an air shutter is placed in the mouth of the prima air opening, the purpose of this being to facilitate easy starti when it is partly closed to produce great air velocity by the spra nozzle. The Breeze carburetor shown at Fig. 196, B, operates practically the same principle as that outlined at A, except th it has a side opening through which the mixture is supplied t mote and the gasoline regulating valve is at the top of the e.

buretor instead of at the side, as is also true of the auxiliary valve. The fuel supply is regulated by a metal float which o ates the lever to shut off the main fuel inlet control valve.

The following instructions are given by the makers of Breeze carburetors for adjusting their device: Before changing justments allow the motor to run awhile, heating it to obtain mal conditions. Advance spark about to center; then open thr very slightly and adjust your gasoline (figured dial) until

highest speed is obtained with this setting; then open throttle w and adjust the auxiliary air by either raising or lowering adjusting stem on the air valve. If the motor speeds up imme ately, auxiliary air is correct; if motor fires back through buretor on high speed, it indicates excessive air, and adjust stem should be drawn up; if slow in picking up, it indicate scarcity of air; in that case, lower the adjusting stem. From thr quarters of a turn to a turn and one-quarter is the usual open of the needle valve required. Screwed all the way down it closed. To open it turn backwards. With the throttle and sp