Full Details

Name and Model Number Keuffel & Esser 4132
Crane Sewer Rule
Country of Origin USA
Date of Manufacture 1910
Front Scales Special for sewer hydraulic design
Back Scales Special for sewer hydraulic design
Scale Length 23.2 cm
Type of Rule Slide Rule
Construction Open frame: 27 cm x 3 cm. Paper scales on mahogany. Riveted end posts of the early Cox patent type.
Area of Use Other
Comment Based on McMath's formula for amount of storm water & Kutter's formula for sewer capacity.
In 1899 to 1927 K&E catalogs. Provenance with a Hazen-Williams Hydraulic slide rule indicates an early date of c. 1910.
Rarity RR
Donor Collection of Ed Chamberlain
Match Number 137
(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.