They still relate an anecdote showing the confidence he had in his work. A gentleman who bought a watch of him just before departing for India, asked him how far he could depend on its keeping the correct time.
"Sir," replied Graham, "it is a watch which I have made and regulated myself; take it with you wherever you please. If after seven years you come back to see me, and can tell me there has been a difference of five minutes, I will return you your money."
Seven years passed, and the gentleman returned.
"Sir," said he, "I bring you back your watch."
"I remember," said Graham, "our conditions. Let me see the watch. Well, what do you complain of?"
"Why," was the reply, "I have had it seven years, and there is a difference of more than five minutes."
"Indeed!" said Graham. "In that case I return you your money."
"I would not part with my watch," said the gentleman, "for ten times the sum I paid for it."
"And I," rejoined Graham, "would not break my word for any consideration."
He insisted on taking back the watch, which ever after he used as a regulator.