Thus we see that the pioneers whose work has counted for the most in the early history of aviation were Americans—that the science can almost be claimed as a development of American genius. True, Ader was the first man to fly in a power-propelled machine, and Lilienthal led the way in the science of gliding, but it remained for Chanute, Langley, Montgomery, and the Wright brothers to gather all this scientific data together and put it to practical use so that the motor could be installed and power flight, or dynamic flight, as the scientists call it, begun.

CHAPTER II
AEROPLANE DEVELOPMENT

HOW THE INVENTORS CARRIED ON THE ART OF AVIATION UNTIL IT BECAME THE GREATEST OF ALL SPORTS AND THEN A GREAT INDUSTRY

SO INTERESTED in aviation had our young friend become that he forgot all other inventions in his enthusiasm for flying. He never missed a chance to go to the aviation field, and sometimes his scientist friend would go with him. These days were rare treats indeed, for the boy always learned some new and important points from their conversations.

With them we have seen how the science of aeronautics has been divided into two great departments: balloons, or lighter-than-air fliers, and all other machines that are not maintained in the air by hot air or gas. We have seen also the three great divisions of heavier-than-air aviation—that is, orthopters or wing-flapping machines; helicopters or machines that fly upward through the operation of horizontal screws; and aeroplanes. Lastly we see the three divisions of aeroplanes: gliders; dynamic aeroplanes, or the machines we know to-day; and true bird soaring, the art of flying without artificial power and without the flapping of wings.

But on every side the boy heard people talking of great feats of flying that he knew nothing about.

"Who was Santos-Dumont? What was that first trans-Channel flight? Why do they always talk about the first Rheims meet?" he asked one afternoon as he was returning home from the field with the scientist.

The man could not answer the questions all in one breath, but we will follow his explanation, which extended over many pleasant hours, and see how aviation developed into a mighty sport and industry.

For several years following 1905 the world of aviation was led by Europeans—mostly Frenchmen who readily grasped the principles of the science and made the best and lightest motors that the world has ever seen. The United States, however, was the first nation to experiment with aeroplanes for military purposes, although at present the country is far behind France, England, and Germany in the development of aeroplanes for use in war.