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1-foot Cassegrain reflecting telescope

1-foot Cassegrain reflecting telescope

James Short
circa 1758
2-foot Gregorian reflecting telescope with split object glass micrometer

2-foot Gregorian reflecting telescope with split object glass micrometer

James Short
circa 1763
astronomical quadrant with achromatic sights

astronomical quadrant with achromatic sights

Jeremiah Sisson
1765
astronomical regulator

astronomical regulator

John Ellicott
1765
astronomical regulator

astronomical regulator

Thomas Tompion
circa 1685
azimuth compass

azimuth compass

Edward Nairne
circa 1765
dip circle

dip circle

Edward Nairne
1765
octant

octant

Benjamin Martin
1764
spare secondary mirror for Gregorian telescope

spare secondary mirror for Gregorian telescope

James Short
circa 1763
surveyor's Y level

surveyor's Y level

Benjamin Martin
circa 1765
variation compass

variation compass

Edward Nairne
1765
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