| | Likely Cause | Manual Reference | | :--- | :--- | :--- | | Micrometer lines won’t coincide | Dirt on glass circle or prism | Section 4: Cleaning optical path | | Image double in telescope | Parallax | Refocus reticle eyepiece | | Stiff vertical motion | Clamp over-tightened | Release clamp 1/4 turn | | Bubbles not visible | Broken bubble vial | Replace (workshop only) |
Always lock the instrument's clamps lightly when placing it in its fitted transit case to prevent it from rattling against the secure wooden blocks or rubber bumpers. hilger watts theodolite manual
Secure or release the rotation of the instrument. | | Likely Cause | Manual Reference |
The manual will warn you: “Permanent adjustments should only be made by a qualified instrument maker.” However, for the user, it describes how to check: Model No
: A general-purpose transit theodolite reading directly to 20 seconds of arc, typically featuring a 25x magnification telescope. Model No. 2
If you have landed here looking for the PDF or a scanned copy of that elusive manual, you are in the right place. This article will explain the history of the instrument, the differences between the major models (the Micropic, the Tavistock, and the 20-inch), and—most importantly—the best strategies for finding, downloading, or reconstructing the original operator’s handbook.
Because of British Commonwealth ties, many Hilger Watts instruments ended up in the Australian Army Survey Corps and the Canadian DOMS (Directorate of Military Survey). Search for "RAAF Hilger Watts manual" or "Canadian NRC Hilger Watts" . The Australian War Memorial has digitized some training manuals that include operation sections for Watts theodolites.