"his friend Edmond Halley"
by cm

Edmond Halley
Public DomainEdmond Halley
Edmond Halley (1656-1742) was the English astronomer who gave his name to Halley’s Comet.   He was a captain in the Royal Navy, and designed a diving bell.   He demonstrated the link between barometric pressure and altitude, and contributed to the development of actuarial science.