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21. A back staff, c. 1700.
*A back staff, c. 1700.The back staff was first described in 1595 by the navigator John Davis and became one of the principle instruments of navigation. It remained in...
22. A back-staff, 1755.
*A back-staff, 1755.A back-staff is a navigational instrument that was developed in the 1500s to measure the height of the sun above the horizon, and so determine the...
23. A navigational octant made by Ramsden.
*A navigational octant made by Ramsden.An octant made by Jesse Ramsden in ebony, ivory and brass. Ramsden was one of the finest London instrument makers.
24. A portable transit instrument.
*A portable transit instrument.A portable transit instrument similar to that used on James Cook’s Transit of Venus expedition of 1769. This telescope is made by Jesse Ramsden...
25. Halley's 5-foot transit instrument.
*Halley's 5-foot transit instrument.The earliest telescope at the Royal Observatory Greenwich that can definitely be associated with its history is Edmond Halley's (1656-1742) 5-foot...
26. Halley's 8-foot mural quadrant and wall.
*Halley's 8-foot mural quadrant and wall.Both Halley's and Bradley's mural quadrants are mounted on a wall of nine massive stone blocks set into the bedrock of Greenwich Hill. Halley, who...
27. Bradley's 8-foot brass mural quadrant.
*Bradley's 8-foot brass mural quadrant.Bradley's quadrant follows the same design as Halley's, the main difference being the metal used. After twenty years of use, the frame of Halley's...
28. Abraham Sharp.
*Abraham Sharp.Abraham Sharp started out as a merchant's apprentice, but gave up business in favour of mathematics. He came to work at the Royal Observatory...
29. A sextant used on Cook's third voyage.
*A sextant used on Cook's third voyage.This sextant is reputed to have been used on Cook's third voyage to the South Pacific. It is one of four known to have survived from Cook's three...
30. A sextant.
*A sextant.The sextant was first made in the late 1850s by the London instrument maker John Bird, then one of the finest makers in the city. He was commissioned...
 
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