Hilger Watts Theodolite Manual ((top)) -

: Rotate the micrometer knob until the upper and lower scale lines coincide.

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Look through the reading eyepiece. Turn the micrometer knob until the graduation lines in the main scale window are perfectly centered within the indexing forks. Once centered, read the main degrees and minutes from the upper window, and read the fine single minutes and seconds from the lower micrometer window. Combine the two readings for your final ultra-precise measurement. 5. Maintenance, Storage, and Calibration

Carefully remove the theodolite from its wooden or metal transit case. Secure it tightly onto the tripod head using the central fixing screw. hilger watts theodolite manual

Whether you have acquired a vintage Microptic No. 1, a Microptic No. 2, or a specialized Vernon instrument, having the right operational knowledge is essential. This comprehensive guide serves as an expanded manual overview, detailing the history, setup, reading methods, and maintenance of Hilger & Watts theodolites. 1. History and Legacy of Hilger & Watts

The manual was also a survival guide for the instrument. It warned of "Natural Errors"—the invisible enemies of precision:

According to the vintage guides, surveying began long before you looked through the lens. It started with the . : Rotate the micrometer knob until the upper

: Regular maintenance as per the manual is necessary to ensure the horizontal and vertical axes remain perfectly perpendicular. 4. Comparison with Modern Technology

: Use the optical plummet (if equipped) to center the instrument precisely over the ground station. Adjust tripod legs to bring the circular bubble near center. Use the three leveling foot-screws to precisely center the plate spirit level Rotate the instrument 90 raised to the composed with power

If the bubble does not stay centered during a 360-degree rotation, bring it back halfway using the footscrews, and the other half using the small capstan screws on the bubble housing itself. If you share with third parties, their policies apply

Built to withstand harsh field environments while maintaining sub-arc-second precision.

Direct reading to 1 minute of arc, estimation to 15 or 30 seconds.

To correct for mechanical imperfections (collimation errors), always take two observations.

Precision is maintained through specific techniques detailed in many professional surveying forums 0;17;: