Search Results - Port Cities

You are here: Search Results

About this Site

Explore this site

Search Results
43 Results found	1 2 3 4 5 Next
The following results matched your search criteria:

1. Ivory cross staff.
	The cross staff was first described in the 14th century and is thought to derive from a surveying instrument. It was taken up by navigators about a...

2. Level for a transit instrument.
	A level for use with a transit instrument. The transit instrument was taken to Station D (Christchurch, New Zealand) of the Transit of Venus...

3. Magnetic dip circle.
	During the 19th century the Royal Observatory Greenwich became an important centre for measuring changes in terrestrial magnetism because of the way...

4. Mural circle.
	Commissioned from Edward Troughton, with the optical parts by Peter and John Dollond, this 6-foot (1.8m) mural circle was first used in 1812. Owing...

5. Horizontal pedestal dial.
	Horizontal pedestal dials can still be found (though now mainly as ornaments) in gardens and churchyards. They are set up so that the noon line lies...

6. 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...

7. Crown compass, 1835.
	This compass was made at Ratcliff Cross by Joseph Hughes in 1835.

8. Dipleidoscope dial.
	A dipleidoscope dial for latitudes 0°-90° North. It has a square base of oxidised brass set on three small feet. Set onto the base are two...

9. 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...

10. Octant, 1753.
	The octant was developed in the early 1730s by John Hadley. The instrument enabled the observer to make more accurate measurements than had...


Email the selected results to:
	1 2 3 4 5 Next

Legal & Copyright

Partner sites:

About this Site