Collections Item Detail
Slide rule model 4081-3 made by Keuffel & Esser Co, N.Y., n.d., ca. 1941.
Object/Artifact
Slide rule model 4081-3, made by Keuffel & Esser Co, N.Y., no date, circa 1941. White celluloid plastic laminated to mahogany wood, 12-1/2" long x 1-5/8" high x 1/4" thick (dimensions not including indicator); with metal braces; improved glass indicator (cursor). Serial number: 776915. Lacking: printed instructions.
Top and bottom edges of rule are hand inscribed: C E Helstrom. Date was derived from the serial number. Serial number appears on back side at the left end of the slide and on the top left edge of the stator. See notes.
Rule is marked on the stator front at the top: Keuffel & Esser Co., N.Y. | Pats. Re.20,943 | 1,930,852 | 2,168,056 | 2,170,144 | Pat. Pend. | Made in U.S.A. Indicator is marked on top edge: Patent 2,086,502. Bottom edge is marked: Keuffel & Esser Co. N.Y.
Scales on front side:
L
LL1
DF
CF
CIF
CI
C
D
LL3
LL2
Inverted for scales on back side:
LL0
LL00
A
G
T
ST
S
D
DI
K
K&E had their main office and factories in Hoboken when this item was made.
2009.001.0042
2009.001
Purchase
Purchase
Museum Collections.
1941 - 1941
Date: 1941-1941
Good
Display Value: Good Notes: Slide rule collector and authority Clark McCoy has identified this as "second edition" as stated and displayed on his website as of 2009. It is called "second edition" because the location of the company name on the front stator is engraved between .1 and .2 on the log scale. Status: OK Status By: dw Status Date: 2009-11-18
