Telegraphy became a hobby with the boy. From every operator along the road he picked up something. He strung the basement of his father's house at Port Huron with wires, and constructed a short line, using for the batteries stove-pipe wire, old bottles, nails, and zinc which urchins of the neighborhood were induced to cut out from under the stoves of their unsuspecting mothers and bring to young Edison at three cents a pound. In order to save time for his experiments, he had the habit of leaping from a train while it was going at the rate of twenty-five miles an hour, landing upon a pile of sand arranged by him for that purpose. An act of personal courage--the saving of the station-master's child at Port Clements from an advancing train--was a turning-point in his career, for the grateful father taught him telegraphing in the regular way. Telegraphy was then in its infancy, comparatively speaking; operators were few, and good wages could be earned by means of much less proficiency than is now required. Still, Edison had so little leisure at his disposal for learning the new trade, that it took him several years to become an expert operator. Most of his studies were carried on in the corner of the baggage-car that served him as printing-office, laboratory, and business headquarters. With so many irons in the fire, mishaps were sure to occur. Once he received a drubbing on account of an article reflecting unpleasantly upon some employee of the road. One day during his absence a bottle of phosphorus upset and set the old railroad caboose on fire, whereupon the conductor threw out all the painfully acquired apparatus and thrashed its owner. Edison's first regular employment as telegraph-operator was at Indianapolis when he was eighteen years old. He received a small salary for day-work in the railroad office there, and at night he used to receive newspaper reports for practice. The regular operator was a man given to copious libations, who was glad enough to sleep off their effects while Edison and a young friend of his named Parmley did his work. "I would sit down," says Edison, "for ten minutes, and 'take' as much as I could from the instrument, carrying the rest in my head. Then while I wrote out, Parmley would serve his turn at 'taking,' and so on. This worked well until they put a new man on at the Cincinnati end. He was one of the quickest despatchers in the business, and we soon found it was hopeless for us to try to keep up with him. Then it was that I worked out my first invention, and necessity was certainly the mother of it.