The No. 2 uses a optical coincidence system to eliminate centering errors.
A coincidence reading system is used where double lines must be perfectly aligned using the micrometer knob before reading the exact seconds. 4. Maintenance, Calibration, and Troubleshooting hilger watts theodolite manual
Features high-quality achromatic lenses with an adjustable eyepiece for focusing the crosshairs (reticle) and a main focusing knob for targeting the object. The No
Based on the review, I would give the Hilger Watts Theodolite manual a rating of 4.5 out of 5 stars. Hilger & Watts (later merged into Rank Hilger)
Hilger & Watts (later merged into Rank Hilger) produced several models. This guide focuses on the series, likely the Watts No. 1 (Single Second) or No. 2 (10 Second) theodolites.
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.
Adjust the mirror on the side of the instrument housing to direct ambient light into the internal optical paths.