Watts Theodolite Manual Link — Hilger

Hilger & Watts produced several iconic theodolites, most notably the Microptic No. 1

13. When to Repair or Replace

• Repair if errors are correctable via standard adjustments, or if optical/mechanical components are serviceable.
• Replace if mechanical wear causes unpredictable errors, if repeated repairs exceed replacement cost, or if modern requirements demand integrated EDM/GNSS features.

If you own a Hilger Watts instrument without its paper, do not despair. Use the resources above—forums, archives, and museums—to locate that PDF. And once you find it, pay it forward: scan it in high resolution (600 DPI) and upload it to Archive.org under the title "Hilger Watts Theodolite Manual [Your Model]" . hilger watts theodolite manual

Last updated: October 2024.

The instruction manual for a Hilger & Watts theodolite is more than just a technical guide; it is a gateway to the pinnacle of British mid-20th-century precision engineering. For surveyors, engineers, and historians, these manuals represent the standard operating procedures for instruments that mapped nations and guided the infrastructure of the post-war world. The Legacy of Hilger & Watts Hilger & Watts produced several iconic theodolites, most

3. Pre-Use Checklist (Actionable)

1. Inspect instrument and case for damage or corrosion.
2. Clean optics with blower and lens tissue; avoid solvents unless specified.
3. Check foot screws and clamps for smooth action; lubricate lightly if sticky (use manufacturer-recommended grease).
4. Verify plate levels move freely and bubble is sharp.
5. Ensure the optical plummet or plumb bob is present and functional for centering.
6. Confirm that circle graduations and verniers/micrometer readouts are unobstructed and legible.
7. Check tripod stability, spread, and head condition.
8. Zero or note last calibration date; if unknown, consider a quick on-site calibration (see Section 6).

2. The Hilger Watts "Tavistock" Theodolite (Model 2 & 3)

• Era: 1950s–1970s
• Typical use: Geodetic surveying, mining, and military mapping.
• Distinguishing feature: Named after the Tavistock Square address in London. Features an enclosed vertical circle and a detachable tribrach. The Model 3 has a 4-inch glass circle.
• Manual difficulty: Moderate. This is the most searched term. Reproduction copies exist.