Whether you are a collector who just acquired a vintage ST110 or a surveyor looking to maintain a piece of optical history, understanding the nuances of the is essential for accurate operation. 1. The Legacy of Hilger & Watts
Provide ultra-fine micro-adjustments for perfectly centering the crosshairs on a target after the main clamps are locked.
. Any significant deviation indicates a collimation error that requires mechanical adjustment via the reticle screws. 6. Sourcing Original Manuals and Digital PDFs
EBay is a double-edged sword. Search for "Hilger Watts manual" or "old theodolite instruction book." Expect to pay $20–$50 for an original printed copy. Be aware of scammers selling "PDF downloads" for $15 that are actually just a single scanned page. hilger watts theodolite manual
Rotate the instrument through 180 degrees. If the bubble remains centered, the instrument is level. If not, repeat the process to eliminate minor errors. Step 3: Focusing and Targeting
For the modern user, the manual is surprisingly accessible. Unlike contemporary digital manuals that focus on software interfaces, this manual focuses on principles of measurement
Rotate the instrument 90 degrees so that the bubble vial points toward the third footscrew. Turn only the third footscrew to center the bubble. Whether you are a collector who just acquired
These glass circles are marked with degrees and minutes.
Formed in 1948 by the merger of Adam Hilger Ltd. and E.R. Watts & Son, the company combined cutting-edge optical engineering with masterful mechanical craftsmanship.
Many models use a direct reading glass circle system, reducing reading errors. Rugged Build Quality: Designed for stability in the field. Precision Optics: Offering sharp, high-contrast images. Sourcing Original Manuals and Digital PDFs EBay is
Rotate back to the original position to verify, and repeat if necessary until the bubble remains centered in all directions. 4. Reading the Microptic Optical Scales
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Vintage brass, steel, and optical glass require deliberate care to prevent degradation and maintain structural calibration.