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 |
|
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. |