Thornton PIC No. 131/PC 18 Differential Electro

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Country of manufacture: England,            Date of manufacture: ____
Overall length: 37.0 cm,          Width: 4.7 cm,           Overall Thickness (including cursor): 1.6 cm,          Weight: 130 gms
Materials: Closed form simplex; celluloid lamimate over mahogany
Cursor: 4.1 X 4.2 X 1.3 cms; metal framed glass lens with 4.2 cm diameter magnifier on swivel stand-off;  lines = three lines
Scales: 16
Front: 27 cm // E₁, E₂, int + A [ B, RC, ISd-ITd, Td-Sd, C ] d + D, ƒ(s)\\ 10 in.
Well: Dynamo-Motor Efficiency, Volts
Slide Back: blank
Back: Various tables, mostly obscured by wear
Gauge Marks: [ π, 746, S (2063), m (3438), U (5729) ]
Condition: C4 (Signs of Minimal use)
Came with: Original cardboard box/case, seriously taped up

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