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Hilger Watts Theodolite Manual
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.
Their theodolites were distinct for several reasons: hilger watts theodolite manual
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. To appreciate the manual, you must first appreciate
Summary for the Operator: Treat the Hilger & Watts theodolite as a mechanical clock. It is robust but relies on friction and precise glass wedges. The key skill is the Coincidence Reading—aligning those lines perfectly before writing down the number. If your FL and FR angles differ by more than a few seconds on horizontal measurements, re-level the plate bubble. The most famous models include the Microptic Theodolite
Many Hilger Watts theodolites allow you to "plunge" the telescope (rotate it 180 degrees in the vertical plane) to check collimation. The manual describes how to release the vertical circle clamp safely without unbalancing the instrument, preventing internal damage.
A massive, heavy instrument made before the Hilger merger. Manuals for these are rare and written in a very formal, engineering-heavy style.
The T2 is arguably the most famous Hilger Watts theodolite. It was a 1-arc-second instrument used for second-order triangulation.
