Skip to content Avoid applying heavy commercial oils or WD-40 to the exposed gears or tangent screws. These attract abrasive dust and gum up the fine threads. Use high-grade, low-viscosity instrument grease sparingly, or leave the mechanisms clean and dry if working in dusty environments.
Knurled screws used to lock the instrument's rotation on its axes.
Use the optical plummet to shift the tripod legs until the crosshairs are roughly over the ground mark.
If you are looking for a specific model's manual (like the Microptic ST1 or a specific year of the Pilot Balloon theodolite), searching for the specific model number in the Met Office repository is a great place to start. To provide more tailored information, could you tell me: hilger watts theodolite manual
Replacing the older, harder-to-read metal verniers, Hilger & Watts pioneered the use of finely etched glass circles that were read through an internal optical micrometer.
Turn both footscrews simultaneously in opposite directions (either both inward or both outward) until the bubble rests perfectly in the center of the lines.
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Never use coarse cloths, fingers, or harsh chemical solvents on the lenses. Use a camel-hair brush to blow away loose dust, followed by high-quality optical lens wipes or a microfiber cloth dampened with specialized lens cleaner.
Never wipe glass lenses with dry cloths or fingers. Use a soft camel-hair brush to remove dust. If necessary, use pure isopropyl alcohol and high-quality optical tissue applied in a gentle circular motion.
Sight a highly defined target roughly 50 to 100 meters away with the instrument in (vertical circle on the left side of the telescope). Record the horizontal and vertical angle readings. Knurled screws used to lock the instrument's rotation
Some models have a knob that moves a glass plate to precisely read the minutes between circle graduations.
For those who own a vintage Hilger & Watts theodolite, the manual is indispensable. It bridges the gap between a "beautiful brass object" and a working scientific tool. It provides the specific specifications—such as magnification power and plate vial sensitivity—that define the instrument's capabilities. Pros and Cons
Employs a coincidence reading system that averages opposite sides of the glass circle to eliminate eccentricity errors.
Geodetic surveying, triangulation, high-precision industrial alignment, and laboratory metrology.
Never use harsh chemical solvents on the exterior paint or the internal glass circles. Use a pure camel-hair brush to remove dust from external lenses, and a drop of pure isopropyl alcohol on a lint-free optical tissue only if grease is present. Storage Protocols
