Sir John Barton also invented a floating compass.
Sir John Barton served as deputy comptroller of the Royal Mint in the early part of the nineteenth century and later as Treasurer to Queen Adelaide.
After his death, his wife Ann gave John Harrison's last pendulum clock to the Royal Astronomical Society.
John Barton's wife was the granddaughter of John Harrison, of longitude fame, which is how Ann Barton had possession of Harrison's last pendulum clock and could give it away.
Sir John Barton became a frequent and well received visitor to Windsor Castle, and his memorial plaque is now to be seen in St. George's chapel there.