Needless to say, the laboratory has many visitors. Celebrities of all kinds and distinguished foreigners are numerous, coming from all parts of the world to see the great inventor and the scene of his activities. XXV EDISON HIMSELF Let us turn from what Edison has done to what Edison is. It is worth while to know "the man behind the guns." Who and what is the personal Edison? Certainly there must be tremendous force in a personality which has been one of the most potent factors in bringing into existence new industries now capitalized at tens of billions of dollars, earning annually sums running into billions, and giving employment to an army of more than two million people. It must not be thought that there is any intention to give entire credit to Edison for the present magnificent proportions of these industries. The labors of many other inventors and the confidence of capitalists and investors have added greatly to their growth. But Edison is the father of some of these arts and industries, and as to some of the others it was the magic of his touch that helped make them practicable. How then does Edison differ from most other men? Is it that he combines with a vigorous body a mind capable of clear and logical thinking, and an imagination of unusual activity? No, for there are others of equal bodily and mental vigor who have not accomplished a tithe of his achievements. We must answer then, first, that his whole life is concentrated upon his work. When he conceives a broad idea of a new invention he gives no thought to the limitations of time, or man, or effort. Having his body and mind in complete subjection through iron nerves, he settles down to experiment with ceaseless, tireless, unwavering patience, never swerving to the right or left nor losing sight of his purpose. Years may come and go, but nothing short of success is accepted. A good example of this can be found in the development of the nickel pocket for the storage battery, an element the size of a short lead-pencil. More than five years were spent in experiments costing upward of a million dollars to perfect it. Day after day was spent on this investigation, tens of thousands of tubes and an endless variety of chemicals were made, but at the end of five years Edison was as much interested in these small tubes as when the work was first begun. So far as work is concerned, all times are alike to Edison, whether it be day or night. He carries no watch, and, indeed, has but little use for watches or clocks except as they may be useful in connection with an experiment in which time is a factor. The one idea in mind is to go on with the work incessantly, always pushing steadily onward toward the purpose in view, with a relentless disregard of effort or the passage of time. [Illustration: THOMAS ALVA EDISON--1911]