John Hadley (chemist)

Born in London to Henry Hadley, he was educated at Queens' College, Cambridge, graduating B.A.

During his time there he co-operated in 1758 with Benjamin Franklin on a series of experiments to investigate latent heat.

They found that a mercury thermometer sprayed with ether which was then evaporated by blowing could fall to −7 degrees Celsius in a warm room.

The Professorship was unpaid so Hadley studied medicine and obtained in 1758 a Physick Fellowship.

He then moved to London in 1760 and got a post as Assistant Physician at St Thomas' Hospital.