0421
    SLOPE REDUCTION CALCULATOR   
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  Surveying Instrument Collection 

Maker

Topcon, Japan

Model

SRC-3 (for use with Topcon GTS-2 )

Serial Number

n/a

Dimensions

132 x 83 x 20 mm

Image

Description

The Topcon GTS-2 (see 0414) is a semi-electronic tacheometer that measures slope distances by electronic distance measurement (EDM). Since the vertical circle of the GTS-2 had to be read optically, the GTS-2 instrument was unable to display horizontal distances and height differences.

The SRC-3 slope reduction calculator could be attached to the power socket in the base of the GTS-02. The slope distance is displayed directly and the horizontal distance and the height difference after entering the optically read zenith angle. Corrections for Earth curvature and refraction can be applied and the units of distance and zenith angle selected.

The SRC-3 clips on the tripod leg if not in use.

Very useful field toll for cases where the horizontal distance and or the height difference was/were required in the field, such as in setting-out work.

History & comments

 

Conservation

 

Condition

some scratches

Remarks

Case carries the inscription "P/C 35807, s/n 258979"

Dates

Catalogued by J. M. Rüeger in 2011. Photos by J. M. Rüeger.

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