Full Details

Name and Model Number Fowler "Jubilee Magnum"
Long Scale Calculator
Country of Origin England
Date of Manufacture 1948
Front Scales C CI Logs D scales no trig scales
Back Scales None
Scale Length 193 cm (76 in)
Type of Rule Watch Type
Construction Glass face, 4.75 inch metal body, with two turning screws
Area of Use Generic
Comment This extra long scale slide rule often allows for readings of 5 significant figures
Rarity RRR
Donor Collection of Clay Castleberry
Match Number 334
(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.