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Theodolite used for the Principal Triangulation of Great Britain

Theodolite used for the Principal Triangulation of Great Britain

1791
100 Link Steel Surveying Chain, 1784.

100 Link Steel Surveying Chain, 1784.

1784
Hydrostatic balance by Jesse Ramsden, London, 1785-1789

Hydrostatic balance by Jesse Ramsden, London, 1785-1789

1785-1789
Sextant by Jesse Ramsden

Sextant by Jesse Ramsden

circa 1772
Square signed "J.Ramsden, 1757"

Square signed "J.Ramsden, 1757"

1757
Sextant by Jesse Ramsden with case

Sextant by Jesse Ramsden with case

1770-1775
Cassegrain reflecting telescope, 1762-1774

Cassegrain reflecting telescope, 1762-1774

1762-1774
Refracting telescope on stand by Ramsden, Dollond and Miller, 1769

Refracting telescope on stand by Ramsden, Dollond and Miller, 1769

1769
Brass framed sextant.

Brass framed sextant.

1790-1800
Set of drawing instruments

Set of drawing instruments

1762-1800
Galilean refracting telescope on folding tripod

Galilean refracting telescope on folding tripod

1785-1795
Gregorian reflecting telescope

Gregorian reflecting telescope

1785-1795
silver-plated single-draw brass prospect glass with painted decorations showing classical figures

silver-plated single-draw brass prospect glass with painted decorations showing classical figures

Brass spyglass with shagreen cover and two eyepiece powers

Brass spyglass with shagreen cover and two eyepiece powers

1700-1799
Pocket brass framed sextant

Pocket brass framed sextant

1785-1795
Parts for a lucernal microscope with body tube signed "Ramsden"

Parts for a lucernal microscope with body tube signed "Ramsden"

1775-1800
Telescope by Ramsden

Telescope by Ramsden

Spyglass hand telescope with brass body and braided string grip on tube

Spyglass hand telescope with brass body and braided string grip on tube

1762-1800
Mahogany keystone box

Mahogany keystone box

1785-1795
Metal component from the 7-inch altazimuth theodolite

Metal component from the 7-inch altazimuth theodolite

1751-1800
'day and night' refracting telescope

'day and night' refracting telescope

1795-1800
Manuscript instructions and receipt for Ramsden solar microscope, 1793

Manuscript instructions and receipt for Ramsden solar microscope, 1793

1793
Brass spyglass decorated with shagreen and with an achromatic lens

Brass spyglass decorated with shagreen and with an achromatic lens

1762-1800
Eight brass screws from the 3-foot geodetic theodolite

Eight brass screws from the 3-foot geodetic theodolite

1791
Screw and nut associated with the 3-foot geodetic theodolite

Screw and nut associated with the 3-foot geodetic theodolite

1791
Metal clamp from the 3-foot geodetic theodolite

Metal clamp from the 3-foot geodetic theodolite

1791
Metal clamp from the 3-foot geodetic theodolite

Metal clamp from the 3-foot geodetic theodolite

1791
Instrument case for prospect glass

Instrument case for prospect glass

spare parts for incomplete orrery planetary model by Jesse Ramsden, 1762-1800

spare parts for incomplete orrery planetary model by Jesse Ramsden, 1762-1800

1762-1800
Spyglass by Jesse Ramsden, 1776-1800

Spyglass by Jesse Ramsden, 1776-1800

1776-1800
Components from the 3-foot geodetic theodolite

Components from the 3-foot geodetic theodolite

1791
Components from the 3-foot geodetic theodolite

Components from the 3-foot geodetic theodolite

1791
Horizontal circle cover

Horizontal circle cover

1791
Six inch silver sector, late 18th century.

Six inch silver sector, late 18th century.

late 18th century
Case for Hadley type brass framed sextant

Case for Hadley type brass framed sextant

circa 1772
Ramsden's astronomical equatorial instrument, with 2-1/4 inch aperture and 18-inch focal length

Ramsden's astronomical equatorial instrument, with 2-1/4 inch aperture and 18-inch focal length

1770-1780
Components from the 3-foot geodetic theodolite

Components from the 3-foot geodetic theodolite

1791
Components from the 3-foot geodetic theodolite

Components from the 3-foot geodetic theodolite

1791
Object glass for refracting telescope

Object glass for refracting telescope

1781-1791
Component of refracting telescope of 4.1-inch aperture

Component of refracting telescope of 4.1-inch aperture

1781-1791
Components from the 3-foot geodetic theodolite

Components from the 3-foot geodetic theodolite

1791
Horizontal circle cover

Horizontal circle cover

1791
Viewing telescope for Hadley type brass framed sextant

Viewing telescope for Hadley type brass framed sextant

circa 1772
Incomplete mechanical orrery

Incomplete mechanical orrery

1762-1800
Architect's rule by Ramsden, c. 1775

Architect's rule by Ramsden

1772-1778
18 inch geodetic theodolite by Ramsden, late 18th century

geodetic theodolite by Ramsden

1751-1800
Keystone-shaped mahogany box for brass sextant with polished frame and limb, by Jesse Ramsden, London, England, 1790-1800.

Keystone-shaped mahogany for brass framed sextant.

1790-1800
Brass sextant with polished frame and limb, by Jesse Ramsden, London, England, 1790-1800. Fitted with hinged stand instead of handle, which can be fitted to threaded hole on the lid of the case. Consists of inlaid silver 129° scale (-2° to 147°) with 20’ divisions, a silver vernier reading to 20”, three filter shades (two red, one green), three horizon shades (two red, one green) and scale magnifier on swivel arm (missing). Fitted with threaded telescope bracket (with detachable dovetail) for telescope (123 mm, set focus?) inverted image, four cross-wires and sight tube (51 mm).

Brass framed sextant.

1790-1800
Ramsden electrical machine

Ramsden electrical machine

1800-1899
Refracting telescope of 4.1-inch aperture on an English type equatorial mounting commissioned by Sir George Shuckburgh from Jesse Ramsden in 1781, though not completed until 1791. First installed at Shuckburgh's home at Shuckburgh Warwickshire, it was later given to the Royal Observatory, Greenwich in 1811 by Charles Jenkinson Shuckburgh's heir. The hour circle was re-divided by Troughton & Simms in 1860 but the stand proved too flimsy and was little used at Greenwich in later years.

Refracting telescope on equatorial mounting

1781-1791