| 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 |
| Thumbnail (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. |