What did an excise officer use a slide rule for?

Excise officers utilised boxwood slide rules to calculate duties on spirits and other taxable goods based on volume and strength. These pocket instruments allowed officials to compute measurements rapidly while conducting inspections in the field.

How do I identify a Sikes hydrometer set?

Sikes hydrometers comprise a weighted brass stem accompanied by a series of small numbered change weights and an ivory-scale thermometer. They were formally adopted to measure the proof strength of alcohol for taxation and commercial trade.

What is an imperial standard yard?

An imperial standard yard served as the official physical measurement of length for a specific county or municipality. Governments commissioned makers like De Grave to produce these verified bars to ensure uniformity in commerce.

Why are some instruments housed in mahogany cases?

Mahogany cases protected sensitive brass mechanisms, glass tubes, and loose weights from dust and impact during transport. Interior velvet linings kept delicate components secure and immobilised while stored in offices or laboratories.

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These vintage measuring instrument examples combine precision engineering with functional design, offering tactile history for collectors of scientific instruments.

19th century

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Nice Antique Thread Tester – Circa 1880

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Nice Antique Thread Tester – Circa 1880

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