Full Details

Name and Model Number Pickett Model 17 Radiation
Country of Origin U.S.A.
Date of Manufacture ~1970
Front Scales C,D + 16 specialized
Back Scales 16 specialized
Scale Length 25 cm
Type of Rule Slide Rule
Construction Plastic
Area of Use Other
Comment A Black Body Radiation Rule.
Rarity RRR
Donor Collection of Rod Lovett
Match Number 24

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.