John Davis & Son, Davis-Grinsted Complex Calculator

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Country of manufacture: England           Date of manufacture: ____
Overall length: 40.5 cm,          Width: 3.9 cm,           Weight: 134.1 gms
Materials: Closed form simplex; celluloid lamimate over wood
Cursor: 3.1 X 4.1 X 0.5 cms; metal framed glass lens,      lines = One
Scales: 7
Front: 38 cm // A (3-cycle log) [ B (log scale of tangents 1°- 45°), C (log scale of secants 0°- 45°), D (3-cycle log) ] E (3-cycle log) || 15 in.
Well and Slide Back: blank
Gauge Marks: [      ]
Back: numerical constants, conversion factors, physical properties of metals and building materials
Condition: C5 (Normal signs of use), some fading of scale lettering
Came with: Original brown cardboard case

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