Follow Land Surveying History Hub and Forum

Land Surveying History Hub is a place for land surveyors to discuss and share surveying history for education of future generations of surveyors.  As a member of this Hub, you can contribute to the Surveying History Timeline and help Build land surveying time capsules. Contribute what your experience and knowledge to the first ever interactive timeline of land surveying history.

15 Historians
👉️Join this Hub
Party Chief

Two men independently rediscovered the sextant around 1730: John Hadley (1682-1744), an English mathematician, and Thomas Godfrey (1704-1749), an American inventor. A sextant is a navigation instrument used for measuring angles, primarily altitudes of celestial bodies. Originally, the sextant had an arc of 60°, or 1/6 of a circle, from which the instrument derived its name. Because of the double-reflecting principle used, such an instrument could measure angles as large as 120°. The image shown is of an early sextant by John Bird which was invented in 1759. The frame is mahogany with an ivory scale. It is so large and heavy that it needed a support that fitted into a socket on the observers belt.

Read more…
E-mail me when people leave their comments –

You need to be a member of Land Surveyors United - Global Surveying Community to add thoughts!

Join Land Surveyors United - Global Surveying Community

Hey there!
It looks like you are enjoying the community content.

That's nice! Please don't forget to mention us if you use what you just copied on your website. Help strenthen the community by linking back to us!


Thank you very much! Have a nice day! :)

Ok. Don't bother me again, for this session.