Thornton PIC No. 172/PC17 Student's Log Log w/differential trig scales

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Country of manufacture: England,            Date of manufacture: ____
Overall length: 31.0 cm,          Width: 3.5 cm,           Weight: 73.7 gms
Materials: Closed form simplex; all plastic
Cursor: 4.1 X 3.8 X 1.3 cms; metal framed glass lens;    lines = three lines
Scales: 11
Front: E₁, int + A [ B, RC, ISd-ITd, Td-Sd, C ] d + D, E₂
Well and Back: blank, except for model i.d.
Slide Back: blank
Gauge Marks: [ π, 746, S (2063), L (2303), m (3438), U (5729) ]
Condition: C4 (Signs of Minimal use)
Came with: Original red cardboard box/case

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