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 at the Philadelphia Centenial Exhibition in 1876, where it astonished Sir William Thomson.

In 1876, Edison sold his factory at Newark, and retired to Menlo Park, a sequestered spot near Metuchin, on the Pennsylvania Railroad, and about twenty-four miles from New York. Here on some rising ground he built a wooden tenement, two stories high, and furnished it as a workshop and laboratory. His own residence and the cottages of his servants completed the little colony.

The basement of the main building was occupied by his office, a choice library, a cabinet replete with instruments of precision, and a large airy workshop, provided with lathes and steam power, where his workmen shaped his ideas into wood and metal.

The books lying about, the designs and placards on the walls, the draught-board on the table, gave it the appearance of a mechanics' club-room. The free and lightsome behaviour of the men, the humming at the benches, recalled some school of handicraft. There were no rigid hours, no grinding toil under the jealous eye of the overseer. The spirit of competition and commercial rivalry was absent. It was not a question of wringing as much work as possible out of the men in the shortest time and at the lowest price. Moreover, they were not mere mechanical drudges—they were interested in their jobs, which demanded thought as well as skill.

Upstairs was the laboratory proper—a long room containing an array of chemicals; for Edison likes to have a sample of every kind, in case it might suddenly be requisite. On the tables and in the cupboards were lying all manner of telegraphic apparatus, lenses, crucibles, and pieces of his own inventions. A perfect tangle of telegraph wires coming from all parts of the Union were focussed at one end of the room.