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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
azimuth compass

azimuth compass

Edward Nairne
circa 1765
dip circle

dip circle

Edward Nairne
1765
object glass micrometer for Cassegrain telescope

object glass micrometer for Cassegrain telescope

Dollond & Son
1758-1764
octant

octant

Benjamin Martin
1764
surveyor's Y level

surveyor's Y level

Benjamin Martin
circa 1765
tripod for surveyor's level

tripod for surveyor's level

Benjamin Martin
circa 1765
variation compass

variation compass

Edward Nairne
1765
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The Collection of Historical Scientific Instruments
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