Full Details

Name and Model Number Bate
Country of Origin United Kingdom
Date of Manufacture circa 1820
Front Scales slider 1: double-length log scales slider 2: scales relating to barrel volumes
Back Scales Ruler measuring 24 in tenths of an inch
Scale Length approx. 23
Type of Rule Slide Rule
Construction Boxwood
Area of Use Other
Comment Probably used in the brewing industry for estimating the volume of the
contents of a partially-filled barrel.
Rarity RRRR
Donor Collection of Trevor Catlow
Match Number 76

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.