| Name and Model Number | Pickett N4-ES with Barrel Magnifying Cursor |
| Country of Origin | USA |
| Date of Manufacture | 1960s |
| Front Scales | 3 cube root scales, DF, | CF, CIF, T, T, ST, S, CI, C, | D, DI, 2 sq. root scales |
| Back Scales | LL1+, LL1-, LL2+, LL2-,DF/M | DCF/M, TH, SH, Ln, L, CI, C, | D, LL3+, LL3-, LL4+, LL4- |
| Scale Length | 10" (25 cm) |
| Type of Rule | Slide Rule |
| Construction | Aluminum |
| Area of Use | Generic |
| Comment | Has very rare barrel magnifying cursor. |
| Rarity | RRR |
| Donor | Collection of Louis J. Gotlib, USA |
| Match Number | 42 |
| 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. |