Full Details

Name and Model Number K&E Chemco
Country of Origin USA
Date of Manufacture  
Front Scales A=B C P = L
Back Scales  
Scale Length 20 ins
Type of Rule Slide Rule
Construction Mahogany with white celluloid face
Area of Use Photography
Comment This slide rule has K&E logo stamped on the front. It is also marked ""Chemco Photoproducts Company Ltd, Glen Cove NY"", and ""Copyright 1950"". I haven't been able to find a mention of it anywhere on the internet, not sure what it is used for.
The A and B scales start at 1 and end at 50
The P scale is folded (starts at 6), and ends at 300.
The L scale is folded (starts at 14) and ends at 700
The C scale is folded (starts at 10) and ends at 100 folded at 10 relative to A and B
Rarity RRRR
Donor Collection of Wayne Harrison
Match Number 404
(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.