?? Rare Professional British Surveying Instrument

Offered for sale is an original ALLBRIT mechanical planimeter, a high-quality British-made precision instrument used by professional surveyors and engineers to calculate the area of irregular shapes on maps and technical drawings.

Unlike decorative or student planimeters, this example is a true working surveyor’s instrument, supplied in its original ALLBRIT metal case with factory calibration tables riveted inside the lid and period handwritten calibration notes.

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Key Features

? Authentic ALLBRIT (UK) planimeter ? Precision measuring wheel, dial, and tracing arm ? Instrument No. 37071 ? Original metal carry case with ALLBRIT branding ? Factory calibration / constant tables present ? Evidence of professional historical use ? Pre-digital surveying technology

Likely dating from mid-20th century (c. 1940s–1960s).

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Condition * Instrument appears complete and original * Dial, wheel, and arms intact * Case shows honest age-related wear consistent with professional use * Calibration notes present (adds authenticity and interest) * Not recently calibrated – sold as a collectible, display piece, or functional antique instrument

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Why This One Is Special * British-made professional instrument * Much rarer than common wooden-cased planimeters * Original calibration tables intact * Excellent display value for: * Surveying & engineering collectors * Museums or heritage collections * Architectural or design studios * Serious antique scientific instrument collectors

This is not a reproduction — it is a genuine working artefact from Britain’s engineering and surveying history.