Full Details

Name and Model Number Keuffel & Esser 4110
Power Trig
Country of Origin USA
Date of Manufacture 1941
Front Scales P, F, A [ B, T, S, CI, C ] D
Back Scales none
Scale Length 13.125" (33.4 cm)
Type of Rule Slide Rule
Construction Celluloid on mahogany
Area of Use Generic
Comment Special issue slide rule.
C and D scales are two cycles and A & D scales are four cycles.
P scale is used to find powers of numbers greater than 1 and
F scale is used to find powers of fractions less than 1.
Serial No. 800008
Rarity RR
Donor Collection of Dr. Paul J. Tarantolo Jr.
Match Number 39
(Click Picture for Details)

In conjunction with our 'donors' we assign a rarity rating to each item, based on the system devised by Herman van Herwijnen
(1929 - 2004), renowned Dutch collector, author, and creator of Herman's Archive, a collection of 5,000 slide rule images on CD.
• RR = Rare - 1 of 25 collectors has one; it may take a year to find an example in the marketplace.
• RRR = Very Rare - only a few known to collectors; may be several years before it comes up for sale.
• RRRR = Extremely Rare - a museum piece; unlikely that an example will come up for sale.