Full Details

Name and Model Number Dietzgen Multiplex-Mack
Model 1762B
Country of Origin USA (Germany)
Date of Manufacture c. 1905
Front Scales A, B, C, & D scales
Back Scales S, L, & T on reverse of slide, K on lower edge, Inch scale on beveled edge
Scale Length 25-cm
Type of Rule Slide Rule
Construction Mahogany wood with celluloid scale surfaces
Area of Use Generic
Comment Has a bi-directional "Multiplex" scale in the B scale position. Patent June 28, 1898 in well beneath slide is for "Mack" slide pressure mechanism. Matal framed cursor. Tables of engineering constants on reverse. Stamped 3379A on back, but Model #1762B on case corresponds with Dietzgen catalog number.
Rarity RR
Donor Collection of Ed Chamberlain
Match Number 119
(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.