Maker

Carl Zeiss, Jena (Germany)

Model

Theo 010

Serial Number

149125

Dimensions

Telescope length 135 mm, Height 284 mm

Image

Description

The Optical Micrometer Theodolite Theo 010 is suited for all geodetic work. The principal application of the instrument was for triangulations of 2nd to 4th order, precision traversing (above and below ground) and field astronomical observations.

The instrument is compact and completely self-contained. All its mechanical and optical elements are conveniently arranged.
The theodolite consists essentially of a fixed base with a rotatable horizontal circle (84 mm diameter) and an upper part, or alidade, which is rotatable on a steel cylindrical spigot and carries the tilting trunnion axis with the vertical circle (60 mm diameter) and telescope, the circle reading microscope and the built-in optical plummet. The centre spigot of the instrument fits into a socket in the tribrach and is secured by the clamp screw (DIN centring system). The tribrach carries the levelling foot screws and is connected to the tripod head through the base plate and the spring plate by the attachment screw. The mirror objective telescope of intrinsic shortness and 31x magnification has internal focusing and is completely dustproof. The effective diameter of the objective lens is 53 mm and the telescopes shortest sighting distance is 2 m.

The manipulating knobs and clamping levers are so situated that they can be easily operated from either telescope position, and the screw threads are completely enclosed and protected. Built-in to the base of the instrument is an optical plummet with which, sighting through the hollow spigot it is possible to achieve a high degree of centring over ground points. 

The horizontal and vertical scale intervals of the micrometer is 1". The altitude bubble sensitivity is 20"/2mm. The circles have double line graduations, the actual division being between the two lines. By turning the micrometer head, the circles apparently move in opposite directions until the upper and lower double lines are made to coincide. The shifting of the images, in minutes and seconds, is shown in a small window on the right hand side of the microscope field. The scale divisions of both the horizontal and vertical circles are in intervals of 20 minutes.

History & comments

Start of production for the Theo 010 was in 1955. The Theo 010 is considered to be a precision theodolite.

Conservation

Wooden box (L 270 mm, W 180 mm, H 380 mm)

Condition

Well preserved, however there is slight visible signs of paint peeling

Remarks

• Weight of instrument is 5.3 kg
• There is only one mirror used for both the horizontal and vertical circle illumination
• Inverted telescope image
• School store no: T63
• Catalogued by F. Pall

Dates

Purchased by UNSW in 1963. Catalogued in 2000.