| Name and Model Number | Webb's Stadia Slide Rule Keuffel & Esser 4105 |
| Country of Origin | USA |
| Date of Manufacture | 1903 first appeared in K&E catalog |
| Front Scales | Stadia surveying scales |
| Back Scales | none |
| Scale Length | Over 48" on a 1½" diameter cylinder 15" long |
| Type of Rule | Cylinder |
| Construction | Paper scales on wood cylinder, felt lined metal cover with one scale |
| Area of Use | Topography |
| Comment | Cost was $5.00 in 1903 K&E catalog.
K&E sold this model from 1903 to 1923. |
| Rarity | RRR |
| Donor | Collection of Clay Castleberry |
| Match Number | 245 |
| 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. |