| Name and Model Number | Keuffel & Esser Brick-O-Meter |
| Country of Origin | USA |
| Date of Manufacture | Labeled – patent applied for – estimate 1950-1955 |
| Front Scales | Quantity Material Height \ Length |
| Back Scales | None |
| Scale Length | 24 cm (9.5 in) |
| Type of Rule | Slide Rule |
| Construction | Light wood with painted front scales – K&E framed glass cursor |
| Area of Use | Other |
| Comment | Used to calculate quantities of bricks for different surface areas. One of K&E's many applications in the 1940’s and 50’s
|
| Rarity | RR |
| Donor | Collection of Clay Castleberry |
| Match Number | 324 |
| 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. |