Full Details

Name and Model Number Hawthorn presentation rule
Country of Origin UK
Date of Manufacture  c1840
Front Scales Routledge variant
Back Scales Tables of “Extreme Strain” and “Measures”
Scale Length 11”
Type of Rule Other
Construction Boxwood & German silver
Area of Use Other
Comment 2-foot, 2-fold used for steam engine design.
These particular variants of Hawthorn’s rule appear to be especially made with added
embellishment in ivory and German silver as presentation rules to a particular
dignitary, this one to “Robt. Hawthorn Snr. Walbottle” the inventor. A number of
examples are known, all have been made by John B. Morris of London (fl 1825 – 1843)
of who little is known. Some ivory bits are missing, whether you think this an
improvement or prefer the simple design of the standard is up to you.
Rarity RRR
Donor Collection of an English gentleman
Match Number 55

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.