| Name and Model Number | Pickett Log Log Vector Hyperbolic Model 4 |
| Country of Origin | USA |
| Date of Manufacture | c. 1949 |
| Front Scales | Root scales DF CF T ST S CI C D DI root scale |
| Back Scales | N1 1/N1 N2 1/N2 DF/m CF/m TH SH L CI C D |
| Scale Length | 25 cm (10 inches) |
| Type of Rule | Slide Rule |
| Construction | Magnesium rule , aluminum end plates |
| Area of Use | Generic |
| Comment | I believe this is the last of the 5 magnesium rules |
| Rarity | RR |
| Donor | Collection of Clay Castleberry |
| Match Number | 292 |
| 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. |