In this room of a Detroit automobile factory the motors are tested before they are placed in the chassis. This is the last operation in assembling the motors. It is called the block test. You can see that the motor in front of the inspector is hitched to an electric motor. If you are skilled enough, oyu can tell the make of the machine. Detroit is the center of the world's automobile manufacture. Far more "cars" are made in this city than in any other. In fact, the industry has largely centered in Michigan, Ohio, Indiana, and New York. Detroit, Flint, Jackson, Lansing, Cleveland, Toledo, Indianapolis, Buffalo, and New York, are important centers of the industry.

Perhaps the greatest single change wrought by the automobile is in the country. The farmer is no logner out of touch with the city. To run his machine, he has built better roads. In some of our Middle Western States, automobile trucks do the hauling. The housewife does her shopping at a city, fifteen miles away, after supper. Mail is daily delivered at the door by an automobile. In Iowa, one person out of every 13 owns a "car"; in Nebraska, one out of 16. The Great War in Europe was a battle of motor trucks, delivering ammunition and shifting men. The "tanks" used by the British were huge steel-clad tractors that laid their own tracks ahead of the wheels. They could clamber over the deepest shell-holes and wide trenches. They were equipped with machine guns. How many automobiles in your state?