K&E 4138 Morrison's Radio Engineer's Slide Rule

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Country of manufacture: USA,            Date of manufacture: ____, Ser. No.: 609827
Overall length: 31.8 cm,          Width: 4.1 cm,           Weight: 78.1 gms
Materials: Celluloid laminate over mahogany, metal end braces, adjustable
Cursor: 3.3 X 5.0 X 1.2 cms; plastic runners, metal framed glass lens, adjustable; lines = single hairline, front and back
Scales: 19, some specialized
Front: 9 (Att. Factor II), 8 (Att. Factor I) [ 7 (d. Miles), 6 (Ed), 5 (P. Watts), 4 (f. Mc) ] 3 (σ, emu), 2 (E, µv/m), 1 (db)
Back: L (db), F (Freq.), A (LC) [ B, CI, C ] D, T, ST, S
Gauge Marks: [π, 2π, R, //, / ]
Condition: C3-C4 (Very Minimal to Minimal signs of use)
Came with: Original black leather and cardboard case, insert with Bur. of Stds. Equivalents

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