Hilger & Watts changed designs subtly over decades.
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Key point: Accurate leveling and centering are foundational—small errors magnify in angular readings and downstream coordinates. Hilger & Watts changed designs subtly over decades
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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.