Periodic checks (every 3-6 months):
Today, Hilger & Watts theodolites—such as the Microptic No. 1, No. 2, and the specialized Vernier models—are highly sought after by surveyors, collectors, and restoration enthusiasts. Because original paper documentation is scarce, this comprehensive guide serves as a digital manual and technical resource for identifying, operating, and maintaining these vintage optical instruments. The Legacy of Hilger & Watts Surveying Instruments
Precision is maintained through specific techniques detailed in many professional surveying forums 0;17;: hilger watts theodolite manual
Before operating a Hilger & Watts theodolite, it is crucial to understand its primary mechanical and optical assemblies.
Instead of static black-and-white line drawings found in original manuals, this feature utilizes high-resolution, interactive 3D schematics accessible via a smartphone or tablet. Periodic checks (every 3-6 months): Today, Hilger &
Always store the instrument in its original green metal or wooden carrying case. Ensure all clamps are lightly loosened when stored to prevent stress on the internal mechanical threads. 7. Troubleshooting Common Issues
Rotate the upper part of the instrument (the alidade) until the long plate bubble vial is parallel to two of your three foot-screws. Always store the instrument in its original green
The No. 2 uses a optical coincidence system to eliminate centering errors.
Features high-grade achromatic lenses, an internal focusing knob, and a crosshair reticle (often with stadia lines for distance measurement).
Turn the theodolite until the long plate bubble is parallel to two of the three leveling footscrews.
Microptic transit theodolite, 1954 - Science Museum Group Collection