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The Royal Society: Science in the Making

Unpublished observations, taken with astronomical brass quadrant by Rev Mr Smith

Reference number: AP/4/17

Date: 14 October 1777

Description

Astronomical observations taken from the top of a church with an astronomical brass quadrant fitted with telescopes and a micrometer for measuring seconds of a degree. A Dollond acromatic object glass telescope of 3 1/2 feet was also used. The objective of these observations was to determine the latitude and longitude of Madras [Chennai, Tamil Nadu, India].

Subject: Astronomy

Written by Smith at Fort St Geo [George, Chennai, Tamil Nadu, India]. Communicated by John Call.

Reference number
AP/4/17
Earliest possible date
14 October 1777
Physical description
Ink on paper
Page extent
2 pages
Format
Manuscript

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Unpublished observations, taken with astronomical brass quadrant by Rev Mr Smith, 14 October 1777, AP/4/17, The Royal Society Archives, London, https://makingscience.royalsociety.org/items/ap_4_17/unpublished-observations-taken-with-astronomical-brass-quadrant-by-rev-mr-smith, accessed on 09 June 2026

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