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1947 K&E N4080-3 Log Log Duplex Trig Slide Rule With Box & Case

Availability:

in STOCK! Only 1 Available

CAD$28.00

s00274
Used

Made in the USA from hardwood mahogany surrounded by white cellulose on all sides, this 10" double-sided (duplex) slide rule permitted scales to be placed on either side. An internal sliding middle section and a patented movable 'glass-enclosed hairline' on front-and-back made it possible to read/use the scales together.

Since 1867 Keuffler & Esser has had a hand in producing & designing superior products, but it wasn't until 1891 that they extended their expertise to the manufacturing of slide rules. Eventually K&E cornered the market for professional engineer-grade rules; quality which can be seen in this 1947 example of the N4080-3 Log Log Duplex Trig Slide Rule. Made in the USA from hardwood mahogany surrounded by white cellulose on all sides, this 10" double-sided (duplex) slide rule permitted scales to be placed on either side. An internal sliding middle section and a patented movable 'glass-enclosed hairline' on front-and-back made it possible to read/use the scales together.

Enough about the history of K&E, let's talk about this slide rule:

• Appears to be hardly used, or at least gently used. No scratches, bumps or dents anywhere - near new condition.
• Comes with its original K&E leather case.
• RARE outer original green outer box is included, with product label "K&E N4080-3".
• Box measures approx. 13" x 3" x 1.5"
• Contains small booklet, "How to Take Care of Your K&E Slide Rule".
• Markings on edge of slide rule: Serial (511113) |  Pats.Pend.  |  Made in U.S.A.  |  N4080-3  |  Log Log Duplex Trig  |  Copyright 1947 by Keuffel & Esser Co.  |  Pats. 1,930,852  2,168,056  2,170,144  2,285,722  2,422,649

Condition Notes: Green box shows some wear appropriate to age, especially to corners. Written inside box is the owner's name, which is also written inside of leather case.

TAGS: drafting 1940s

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1947 K&E N4080-3 Log Log Duplex Trig Slide Rule With Box & Case

1947 K&E N4080-3 Log Log Duplex Trig Slide Rule With Box & Case

Made in the USA from hardwood mahogany surrounded by white cellulose on all sides, this 10" double-sided (duplex) slide rule permitted scales to be placed on either side. An internal sliding middle section and a patented movable 'glass-enclosed hairline' on front-and-back made it possible to read/use the scales together.

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