Full Details

Name and Model Number Music String Calculator
Country of Origin England
Date of Manufacture 1990
Front Scales 4 specialised
Back Scales None
Scale Length 36.7 cm
Type of Rule Slide Rule
Construction Cardboard on Wood
Area of Use Other
Comment Though the dimension and composition of strings for different musical instruments are defined by various scaling rules and much experience,
frequency depends on the dimensions in a way summarised by the formula on the slide rule which contains 5 variables and 2 constants.
This slide rule translates the formula into analog form and generalises it to most types of music string.
Rarity RRRR
Donor Collection of Patrick Barrington
Match Number 88

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.