This article provides a comprehensive deep-dive into the history of Hilger Watts, the specific models they produced, how to locate a , and how to use that manual to keep your instrument in perfect working order.
Integrated into the alidade or tribrach base, this small optical sight points directly downward, allowing the surveyor to center the instrument perfectly over a ground marker or peg. 3. Setup and Leveling Procedure
Treat the Hilger & Watts theodolite as a mechanical clock. It is robust but relies on friction and precise glass wedges. The key skill is the Coincidence Reading —aligning those lines perfectly before writing down the number. If your FL and FR angles differ by more than a few seconds on horizontal measurements, re-level the plate bubble.
Direct the external illumination mirror toward a light source (or turn on the battery-powered illumination pack if equipped). hilger watts theodolite manual
Unlike modern digital theodolites, Hilger Watts models use a complex optical micrometer to interpolate between the graduation marks on the glass circles. The manual provides the exact procedure for:
series, which are characterized by their compact design and optical reading systems. While original printed manuals are vintage items, you can find digital reprints or specific operating instructions through specialized archives and collectors. Science Museum Group Collection Accessing Manuals and Technical Guides Vintage Machinery Archive
Always store the instrument in its original carrying case, with the clamps tightened gently. Handling: Never force a screw or clamp. 6. Sourcing a Hilger & Watts Manual This article provides a comprehensive deep-dive into the
The tangent screws and moving parts require specific lubricants. The manual will often specify specialized watchmaker-grade oils or greases; automotive or general-purpose grease will cause the instrument to seize in cold weather.
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Internal glass circles read via an optical micrometer, eliminating the need for external vernier scales. Setup and Leveling Procedure Treat the Hilger &
For more information on the Hilger Watts theodolite manual, please refer to the following resources:
The manual states: “Never unscrew a lens cell. Dust on the internal circle glass must be ignored; do not attempt to access it. For external lenses, use camel hair brush only.”
A massive, heavy instrument made before the Hilger merger. Manuals for these are rare and written in a very formal, engineering-heavy style.
[ Telescope Focus Ring ] | [ Eyepiece Focus ] ------ [ Optical Sight ] | [ Vertical Circle Housing ] | [ Circle Reading Eyepiece ] | [ Upper Tangent Screw ] --- [ Plate Bubble Level ] | [ Lower Tangent Screw ] | [ Tribrach Base ] | [ Levelling Footscrews ]