Description
Unbranded Boxwood Logarithmic Slide Rule
Classic Mid‑Century Calculator | Crisp Logarithmic Scales & Smooth Action
This unbranded boxwood logarithmic slide rule is a beautifully preserved example of mid‑20th‑century mathematical instrumentation. Before electronic calculators became standard, slide rules like this were essential tools for engineers, surveyors, draftsmen, and students working with multiplication, division, ratios, logarithms, and scientific calculations.
Made from boxwood with printed logarithmic scales and fitted with a metal cursor, this slide rule offers the tactile precision and clarity that made wooden rules the preferred choice for decades. The cursor moves smoothly and aligns accurately, while the centre slide — although not photographed — moves freely, with no slop and reveals crisp, clean markings with noticeably less patina than the outer surfaces.
Although unbranded, the construction style, material choice, and scale layout are consistent with English and European slide rules produced between the 1930s and 1960s, making this a reliable and attractive example of the period.
Key Features:
- Logarithmic scales: used for multiplication, division, ratios, and scientific work.
- Metal cursor: smooth‑moving alignment window for precise readings.
- Unbranded manufacture: typical of smaller English and European makers.
- Likely 1930s–1960s production: based on materials, printing style, and construction.
- Crisp markings: all markings including those we didn’t photograph have excellent clarity.
- Collectable scientific instrument: ideal for engineers, collectors, and educators.
Condition
This slide rule is in nice vintage condition, with clean boxwood surfaces and clearly printed logarithmic scales. The outer faces show a gentle patina consistent with age, while the centre slide — which moves smoothly — reveals crisp, bright markings with very little ageing.
The metal cursor is intact, moves freely, and aligns accurately across all scales. There are no cracks, chips, or structural defects visible on the rule. All components operate as intended, making this a functional and visually appealing example of a classic logarithmic slide rule.