Full Details

Name and Model Number Hawthorn’s rule
Country of Origin UK
Date of Manufacture c1832
Front Scales Routledge variant
Back Scales Routledge variant
Scale Length 11”
Type of Rule Other
Construction Boxwood & German silver
Area of Use Other
Comment A 2-foot, 2-fold rule used for steam engine design.
Hawthorn’s rule appears to be especially attractive as a presentation rule as many are seen
with an engraved name somewhere on it. This particular fully bound example by J. Tree (1850 – 1895)
is extremely attractive with its German Silver furniture and outside binding on the usual boxwood
finish. Two very different instruction booklets are known to have been published, the first in 1832.
Rarity RRR
Donor Collection of an English gentleman
Match Number 56

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.