Full Details

Name and Model Number Noble’s single rule
Country of Origin UK
Date of Manufacture  c1895
Front Scales Routledge variant
Back Scales Engineering and steel measure
Scale Length 11”
Type of Rule Other
Construction Boxwood & brass
Area of Use Other
Comment 2-foot, 2-fold rule used in engineering.
Noble’s single slide rule is perhaps even rarer than the double 2-foot, 2-fold slide rules,
it has the usual Noble 5 – 50 ‘D’ scale, but carries steel plate tables on the reverse side.
There is only one version of Noble’s single rule, but it is obviously a Noble designed variant
as it is mentioned in passing in his instructions for the ‘Eureka’ slide rule which was published
in several editions including after his death in about 1910. Despite carrying the statement
“...made by James Noble” it also carries an Edward Preston Trade Mark.
Rarity RRR
Donor Collection of an English gentleman
Match Number 53

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.