0167
   ABNEY LEVEL  
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  Surveying Instrument Collection 

Maker

Esdaile, Sydney

Model

Abney Level

Serial Number

50806

Dimensions

185 x 45 x 78 mm

Image

Description

This Abney Level is made from heavy brass. The coarse and fine motion screws are made from Aluminium. The tubular 'telescope' has a square cross section (18 x 18 mm), an extendable eyepiece and a horizontal wire at the target end. The main half-circle is graduated to 1 degree (from -90 degrees to + 90 degrees) and is read with a vernier graduated in five minute steps. The vernier is read through a magnifying glass.

The tubular level is viewed through a 45 degree mirror on the left side of the viewing tube. It has spring loaded adjustment screws. The Semicircle also carries two auxiliary scales graduated from 0 to 100% (gradient), 100% being a 45 degree slope.

History & comments

Used for measuring slope angles (in steel band taping)

Conservation

in leather pouch 180 x 100 x 57 mm (not original)

Condition

black paint missing on two sides of tube, some verdigris

Remarks

Pouch marked LO 99(with marker pen), No. 12 (with Dymo Tape) and "2" (in paint)

Dates

Catalogued by JMR in Oct 2011. Photo by JMR.

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