Full Details

Name and Model Number Pickett N 610-ES Hydraulic
Country of Origin USA
Date of Manufacture 1966 - 1970
Front Scales LL1, A [B, ST, T, S, C] D, DI, K
Back Scales A, B [C, D] E See Comments
Scale Length 6"
Type of Rule Slide Rule
Construction Aluminum
Area of Use Other
Comment For American Pipe and Construction Co.
Copyright 1966 N.D. Whitman Jr.
Back scales:
Diameter for Velocity
Velocity, feet per second
Diameter for Quantity
Quantity, cubic feet per second
Manning's n
Hydraulic Gradient, feet per 100 feet
Rarity RRR
Donor Collection of Ron Knapp, USA
Match Number 82
(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.