0158
    ALIDADE   
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  Surveying Instrument Collection 

Maker

E. Esdaile & Sons P/L, Sydney

Model

(Non-telescopic) Alidade

Serial Number

481053

Dimensions

458 x 63 x 117 mm

Image

Plane Table Alidade

Description

Non-telescopic alidade for plane table work. The alidade features:

- gun sight with two foldable parts at the ends of the base, one featuring a slit and the other an opening with a vertical thread (broken in this sample).

- parallel ruler (457 mm long) with a lateral movement of 25 mm

- spot bubble (25 mm diameter on base)

- small magnetic box compass (70 x 22 x 13 mm, graduated at -5 , 0, +5) mounted, with locking mechanism.

The alidade is most likely made of brass. All surfaces painted in black.

 

History & comments

Used in connection with a plane table (e.g. see 0153)

Conservation

in leather case (475 x 75 x 25 mm).

Condition

some chipping of paint, thread of gun sighht broken.

Remarks

leather case marked 'L047' in felt pen.

Dates

Catalogued by JMR in July 2010. Photo by JMR.

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