Henry Gregory

Infobox Person
name = Henry Gregory


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birth_date = 1744
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death_date = 1782
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occupation = Mathematical instrument maker
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Henry Gregory (1744 - 1782) was a mathematical and optical instrument maker in business from c. 1750 - 92 from premises in Francis Court, Clerkenwell, London and an establishment known as "The Azimuth Compass" in Leadenhall Street, London. His company later became known as became Gregory and Son.

Gregory manufactured navigational instruments, including quadrants of the type invented by John Hadley and compasses, and one of his azimuth compasses travelled with the explorer James Cook on his second voyage to the southern Pacific Ocean in 1772–1775 (an azimuth compass is a compass fitted with vertical sights, used to take the magnetic azimuth of a star or planet).

References

*cite book | author=Clifton, Gloria | pages=p. 119 | title=Directory of British Scientific Instrument Makers 1550-1851 | location=London | publisher=Philip Wilson | year=1995 | id=ISBN 0-302-00634-6