K&E N4053-2 Mannheim Polyphase

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Country of manufacture: USA,            Date of manufacture: 1925--28,      Ser. No.: 124159
Overall length: 22 cm,          Width: 3.5 cm,           Weight: 49.4 gms
Materials: Celluloid laminate over mahogany
Cursor: 2.6 X 3.8 X 0.6 cms; plastic runners, metal framed glass lens; lines = single hairline
Scales: 11
Front: 8 in // A [B, CI, C] D, K || 20 cm
Slide Back:      S, L, T
Gauge Marks: [π, 785, ' (1970), '' (1182) ]
Back: physical constants, conversion factors
Condition: C5 (Signs of normal usage, but cusor has been replaced).
Came with: Manual for a N4053 printed in 1944.
Notes: A prior owner has replaced the original cursor with a more recent one. Because of its serial number, the rule itself probably dates from around 1926, but the metal framed cursors weren't introduced until 1936. Also, this particular cursor was probably intended for use on a rule with a K-scale on the bottom edge, which this N4053-2 does not have.

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