Full Details

Name and Model Number ADF Products
ARC Engineer's Slide Rule
Model 103
Country of Origin USA
Date of Manufacture c.1960
Front Scales D, L, DI, S, T, ST, K, R, LL3, LL2, LL1, LL01, LL02, LL03, TH, SH2, SH1, LL0, LL00
Back Scales NONE
Scale Length Outer D & L scale: 24-cm; inner LL00 scale 7-cm long.
Type of Rule Slide Rule
Construction Painted aluminum with 2 transparent cursors
Area of Use Technical
Comment This semi-circular slide rule was designed by Andrew Frankenfield, who still lives in New Jersey. He designed and sold this slide rule. The production was limited, as no examples are known to be in circulation.
Rarity RRRR
Donor Collection of Ed Chamberlain
Match Number 102
(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.