Full Details

Name and Model Number Vade Mecum
Country of Origin England
Date of Manufacture  
Front Scales 7 specialised
Back Scales 5 specialised
Scale Length 32,3 cm maximum
Type of Rule Slide Rule
Construction Wood with brass end-pieces
Area of Use Other
Comment Designed by George Bousfield for the Timber Trade
Rarity RR
Donor Collection of Rod Lovett
Match Number 30

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.