| Name and Model Number | Keuffel & Esser Nordell Sewer Slide Rule |
| Country of Origin | USA |
| Date of Manufacture | 1928 |
| Front Scales | Discharge/Velocity T(Time) [ L(Length) H(Drop) ] Diameter (for 3 friction coefs.) |
| Back Scales | Advertisment |
| Scale Length | n/a |
| Type of Rule | Slide Rule |
| Construction | Printed scales on polished boxwood. No indicator. |
| Area of Use | Other |
| Comment | Special slide rule for use by sewer engineers in designing sewer systems.
Sewer drainage and flow calculations. No model number. Same scales as front side of 4128 Nordell Sewer Slide Rule, but not a duplex rule. |
| Rarity | RRR |
| Donor | Collection of Dr. Paul J. Tarantolo Jr. |
| Match Number | 46 |
| 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. |