| Name and Model Number | Pickett Model 523-ES LOROP |
| Country of Origin | USA |
| Date of Manufacture | est. 1960 |
| Front Scales | Upper body, specialized A, D, Cot/Tan Slide, specialized E, C, Csc/Sec, K, C Lower body, specialized C+, C-, C* |
| Back Scales | Upper body, Specialized Csc1, Sec1, D C, C1, B, C Lower body J, Q, Qa |
| Scale Length | 25 cm |
| Type of Rule | Slide Rule |
| Construction | Aluminum |
| Area of Use | Photography |
| Comment | 1)LOROP = LOng Range Oblique Photographic camera.
Oblique Photography Mensuration Slide Rule. This extremely uncommon slide rule may be RRRR = Extremely Rare -- a museum piece; unlikely that an example will come up for sale. 2) The LOROP designated [in error by Pickett]as a Pickett 525-ES is an extremely rare prototype. The Pickett 525 is a Statistics Slide Rule |
| Rarity | RRR |
| Donor | Collection of Richard Davis |
| Match Number | 402 |
| 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. |