Post a clear photo of your theodolite. Ask specifically: "Seeking a PDF of the Hilger Watts theodolite manual for a Tavistock Model 2." Veteran surveyors often have a scanned copy on a dusty hard drive.
Following these steps precisely—exactly as written in the Hilger Watts theodolite manual—can restore an instrument from being a paperweight to being accurate to within a few arc-seconds. hilger watts theodolite manual
Practical tip: Use two-person teams (one at instrument, one at target) to improve speed and reduce parallax errors. Post a clear photo of your theodolite
To appreciate the manual, you must first appreciate the machine. Adam Hilger founded his company in London in 1874, specializing in scientific spectroscopes and astronomical instruments. In 1948, the company merged with E. R. Watts & Son, a firm famous for its surveying instruments and optical dividing engines. The resulting entity, Hilger & Watts Ltd., became a powerhouse in precision optics. Practical tip: Use two-person teams (one at instrument,
Their theodolites were distinct for several reasons:
The most famous models include the Microptic Theodolite (Models T0, T1, T2, T3) and the Watson "M" Series. Each model requires a specific Hilger Watts theodolite manual due to differences in their clamping systems, bubble levels, and micrometer optics.
Curators will not lend the manual, but they will often email you a PDF of their reference copy for research purposes.