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Item#TypeModel No.Match No.Variant No.Model NameMakerCountryProduction or Serial No.MaterialScale LengthDateCondition
KEU370Linear
4133
4417
n/a
Roylance ElectricalKeuffel & EsserUSA
35
Engine divided celluloid laminated mahogany
"8"
1913
C6

Notes: Metal framed glass indicator with three cursor lines. Special slide rule for use by engineers in making various electrical calculations. Centimeter scale on back side below table. Table of current carrying capacity of various wires in slide well.

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