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A Fuller's Time Telegraph and Palmer's Computing Scale, English, circa 1850, image 1
A Fuller's Time Telegraph and Palmer's Computing Scale, English, circa 1850, image 2
Various Properties
Lot 32

A Fuller's Time Telegraph and Palmer's Computing Scale,
English, circa 1850,

15 September 2021, 14:00 BST
London, Knightsbridge

Sold for £510 inc. premium

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A Fuller's Time Telegraph and Palmer's Computing Scale, English, circa 1850,

the double faced circular calculator comprising of a square board with gilt black leather border surrounding printed scales with central volvelle, the obverse carries Fuller's Time telegraph which enables the number of days, weeks or months to be determined between two given dates without calculation, the reverse is Aaron Palmer's circular slide rule with scales for percentages, monetary transactions, and interest, in leather cover marked Fuller's Computing Scale, &c. Library, House of Lords, together with printed Key to Fuller's Computing Scale, &c and Table of Mechanical Movements,
11 1/4in (28.5cm) square

Footnotes

The calculator was publicised as 'The Great Master Key Rule', a comprehensive mathematical tool 'by which all problems are instantly solved'.

Additional information

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