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11. Thomas Earnshaw (1749-1829).
*Thomas Earnshaw (1749-1829). Earnshaw was a London watchmaker who improved and simplified George Graham's clock at the Greenwich Observatory. He devised the spring detent...
12. The Royal Laboratory at the Woolwich Arsenal.
*The Royal Laboratory at the Woolwich Arsenal. The Royal Laboratory at Woolwich was completed in 1696, and was used for the invention and development of weapons. By 1777 the laboratory and its...
13. The Endeavour under repair in Endeavour River, 1770.
*The Endeavour under repair in Endeavour River, 1770. In June 1770 the 'Endeavour' was badly damaged running aground on the Great Barrier Reef. The ship limped into Endeavour River on the coast of New...
14. The 1714 Act of Longitude.
*The 1714 Act of Longitude. The British government took radical measures by passing an Act of Parliament that offered a maximum cash prize of £20,000 to anyone who could...
15. John Flamsteed.
*John Flamsteed. A portrait of John Flamsteed, the first Astronomer Royal.
16. Johannes Flamdteedius Derbiensis Astronomical Professor Regius Anno Aetatis 74 Obyt December 31 1719.
*Johannes Flamdteedius Derbiensis Astronomical Professor Regius Anno Aetatis 74 Obyt December 31 1719. This engraving shows John Flamsteed, who was appointed 'our astronomical observer' by Charles II in March 1675. His task was to make a new map of the...
17. A double sextant, 1797.
*A double sextant, 1797. The sextant takes its name from its shape, a sixth of a circle. Astronomical sextants had been in use since the 16th century but the marine version...
18. A medal commemorating John Rennie (1761-1821).
*A medal commemorating John Rennie (1761-1821). A bronze medal commemorating John Rennie, one of the great civil engineers of the Industrial Revolution. His projects included the West India Docks,...
19. A cross-staff, c. 1700.
*A cross-staff, c. 1700. The cross-staff was a device for measuring the altitude of the sun or Pole Star. It made use of the properties of right-angled triangles, or...
20. A compass, 1766.
*A compass, 1766. The first major improvement to the mariner's compass came in the mid-18th century with the work of Dr Gowin Knight. In 1745 he invented a method of...
 
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