Theodolite (detail)

This is a detail of a theodolite, a surveying instrument for measuring horizontal and vertical angles. This theodolite was made around 1850, probably by Alexander Adie & Son of Edinburgh. It was designed in 1844 by John Sang, a land surveyor.

The detail shows the lower part of the theodolite, and the system of two screws by which the instrument is levelled. Most theodolites use three or four screws to level the instrument.

Record details

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Online ID:	000-190-001-051-C
Image Rights Holder:	National Museums Scotland
Project:	0098: National Museums Scotland Project description \| View all records in project
Ref:	National Museums Scotland T.1971.16
Date:	Around 1850 c. 1850
Material:	Blackened brass, silver scales. Inscription: Adie & Son / Edinburgh
Dimensions:	220 mm H overall
What:	Theodolite
Subject:	5. CARTOGRAPHY, Surveying (Departmental Classification)
Who:	Adie and Son, Edinburgh (Maker)
Where:	Scotland, Midlothian, Edinburgh
Event:
Description:	Four-inch theodolite of brass, signed by Adie and Son of Edinburgh, c. 1850
References:	Sang, John. 'Description of an Improved Apparatus for Levelling Small Theodolites', Transactions of the Royal Scottish Society of Arts 2. (1844) pp 306-7
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