After pondering over the subject, he proceeded to London in 1728, and exhibited his drawings to Dr.Halley, then Astronomer-Royal.

The Doctor referred him to Mr.
George Graham, the distinguished horologer, inventor of the dead-beat escapement and the mercurial pendulum.

After examining the drawings and holding some converse with Harrison, Graham perceived him to be a man of uncommon merit, and gave him every encouragement.

He recommended him, however, to make his machine before again applying to the Board of Longitude.
Harrison returned home to Barrow to complete his task, and many years elapsed before he again appeared in London to present his first chronometer.
The remarkable success which Harrison had achieved in his compensating pendulum could not but urge him on to further experiments.

He was no doubt to a certain extent influenced by the reward of 20,000L.