|Name and Model Number||Keuffel & Esser |
4031 or 4032
|Country of Origin||USA|
|Date of Manufacture||4031: 1903 - 1913, 4032: 1901|
|Front Scales||5 inch /, A [ B C ] D, | 13 cm|
|Back Scales||[ S L T ]|
|Scale Length||5 in.|
|Type of Rule||Slide Rule|
|Construction||Celluloid on mahogany|
|Area of Use||Generic|
|Comment||Could be Model 4031 or Model 4032.
Magnifying cursor for Model 4031 was offered as a separate item by K&E.
Magnifying cursor was standard on Model 4032.
No model number on rule.
|Donor||Collection of Clay Castleberry|
(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.|