Full Details

Name and Model Number Thornton F5100 Radiation
Country of Origin England
Date of Manufacture  
Front Scales 13 specialised
Back Scales 6 specialised
Scale Length 40.9 cm maximum
Type of Rule Slide Rule
Construction Mahogany and Plastic
Area of Use Other
Comment Black Body Radiation
Rarity RR
Donor Collection of Rod Lovett
Match Number 31

RR = Rare -- 1 of 25 collectors has one; it may take a year to find an example in the marketplace.   
RRR = Very rare -- only very few known to collectors; may take several years before one comes up for sale.   
RRRR = Extremely rare -- a museum piece; unlikely that an example will ever come up for sale.