Bracket clock, English, c 1750.
© Science Museum / Science & Society Picture Library
This is a good example of the work of George Graham (1674-1751), English precision clockmaker and scientist, and was made towards the end of his life. Graham worked with Tompion between the years 1695 and 1713 and their clocks often bear resemblances. This clock in an ebony case repeats the hours and quarters, has a verge escapement, and is provided with Graham's regulator dial, in which the pendulum suspension spring is attached to a lever arm. The day of the month is indicated through the small aperture low down on the dial.