Surveying Instrument Collection
Maker |
Topcon, Japan |
Model |
ET-1 |
Serial Number |
F30405 |
Dimensions |
210 X 180 X 365 mm |
Image |
|
Description |
Electronic tacheometer (electronic theodolite with built-in electronic distance meter). Accuracy: horizontal directions ±2", zenith angles ±3", slope distance ±(5 mm + 5 ppm). This instrument type was the first fully electronic tacheometer produced by Topcon. It includes a tribrach and a battery that sits on top of the standards. Measurements can be triggered without touching the instruments (use of light barriers). Weight with battery: 8.3 kg. |
History & comments |
This instrument was purchased by UNSW second-hand from the (NSW) Department of Main Roads in 1994. |
Conservation |
In yellow transport box ( 530 x 370 x 240 mm). |
Condition |
A lot of scratches on paint. The instrument exhibits intermittent problems (of low supply voltage) and is, thus, not fully operational. |
Remarks |
Carries the labels 'DMR-72', UNSW 'No. 2'. |
Dates |
Manufactured ca. 1983. Catalogued by J. M. Rüeger on 3 December 2002. Photo by J. M. Rüeger. |