Slide rule - sliding Gunter rule

Sliding Gunter rule, improved by J. Robertson, as described in W. Mountaine, “A Description of the Lines drawn on Gunter’s Scale, as Improved by Mr. John Robertson”, London, 1778.
This type is also described in the following article, which mentions 4 other known examples:
R. Otnes, “Robertson’s Slide Rule with Runner”, Journal of the Oughtred Society, 8:2, Fall 1999.
This article explains that the “holes” at the right side cross-section were used to attach a fine adjustment screw system for precise positioning of the slide.

Object Details

ID: NAV0190
Type: Slide rule - sliding Gunter rule
Display location: Not on display
Creator: W. & S. Jones
Date made: circa 1800
Credit: National Maritime Museum, Greenwich, London, Adams Collection
Measurements: Overall: 7 mm x 857 mm x 57 mm
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