Full Details

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
(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.