for the air cavity in front of the disc. And so, after the telephone had been hired as Bell's helper. He began a work that to-day requires an suggestions. It was Watson who took the telephone as Bell had made it, into a Punch-and-Judy squeal; and if it was too thin, the voice became a all-iron would vibrate under the slight influence of a spoken word. But better, and presently they threw away the gold-beaters' skin and used business, and by 1880 had taken out sixty patents for his own Until 1878 all Bell telephone apparatus was made by Watson in Charles he and Watson noticed that when the patch was bigger the talking was had used a disc of fragile gold-beaters' skin with a patch of sheet-iron the iron alone. of the class of scientific toys, and another year or two to present it Also, it was Watson who spent months experimenting with all sorts and glued to the centre. He could not believe, for a time, that a disc of army of twenty-six thousand people. He was for a couple of years sizes of iron discs, so as to get the one that would best convey the hollow and sepulchral groan, as if the speaker had his head in a barrel. really a toy, with its diaphragm so delicate that a warm breath would put it out of order, and toughened it into a more rugged machine. Bell Other months, too, were spent in finding out the proper size and shape the total engineering and manufacturing department of the telephone sound. If the iron was too thick, he discovered, the voice was shrilled for the shop. Orders fell five weeks behind. Agents stormed and fretted. Williams's little shop in Court Street, Boston--a building long since properly to the business world. transformed into a five-cent theatre. But the business soon grew too big been perfected, IN PRINCIPLE, a full year was required to lift it out