It took Bell several days of tinkering, but soon he was able to replicate Gray’s device. On March 10, he made that now-famous call: “Watson — come here — I want to see you.” Both Bell and his assistant Watson recorded the event that night in their notebooks.
But Bell didn’t want to simply duplicate Gray’s work; he wanted to invent a telephone of his own. He spent many months trying to develop a telephone that worked on a different principle, but never succeeded in getting it to clearly transmit audible speech. Bell was always extraordinarily reluctant to demonstrate his telephone, for fear that Gray would learn it was a simple copy. Mabel had to trick him into attending the Centennial Exposition, where he was supposed to demonstrate his work to a group of engineers, including Elisha Gray. On one occasion, Bell’s telephone patent was set to be annulled unless Bell would swear under oath that the invention was truly his. Bell fled the country, testifying only at the last minute after desperate pleading from Mabel.