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.
Since leveling shifts the instrument slightly, check the Optical Plummet again. hilger watts theodolite manual
Sight a sharp target at Face Left, record the reading. Flip to Face Right, sight the same target. The difference should be exactly 180 degrees. If an error persists, use the reticle adjusting screws to shift the crosshairs halfway toward the correct reading. Care and Storage The tangent screws and moving parts require specific
If you need help operating a specific model, feel free to share you have, whether it uses a coincidence micrometer or a direct scale , or what specific field adjustment you are trying to perform. Share public link Sight a sharp target at Face Left, record the reading
Whether you are a land surveyor, a vintage engineering collector, or an industrial historian, understanding how to operate, maintain, and reference a is essential.
Attempting to operate a vintage Hilger Watts theodolite without its manual is a recipe for broken glass and stripped screws. These are not intuitive instruments. Key functions that require the manual include:
While theodolites excel at measuring angles, they cannot measure distances on their own, requiring a separate tool like a tape or chain. Modern digital versions now include electronic readout screens, but many professionals still value the Hilger & Watts for its independence from batteries and its legendary optical quality.