Title
Equatorial telescope. A brass telescope mounted on a set of large, ornate brass wheels with finely graduated scales on them.
Identifier
ABDNP:200001a
Description
Universal equatorial instrument. 18th century instrument for positional measurement of stars with telescope mounted on an equatorial mount having finely graduated scales. Brass with 18" circles. Originally made by Sisson. Afterwards divided anew, with an achromatic telescope and 'refraction apparatus' (to correct for atmospheric refraction) added by Ramsden. Optics missing. Badly cleaned sometime 1955-1965.
Date
created 1760-1777, modified by Ramsden in 1782
Format
Brass, glass. The large rings are 457.2 mm wide.
Creator
Jeremiah Sisson (1720-1783), modified by Jesse Ramsden (1735-1800)
Subject
Patrick Copland, astronomy, telescope, science, history of science
Type
Physical Object
UUID
30797b5d-891f-43ca-aeaf-472524fb3011
