Rolling Parallel Rule
Accession Number: 2012.ast.4
A rectangular wooden box that contains a rectangular scale rule wrapped in paper. The scale rule is composed of dark wood, ivory measurement scales on both sides and brass adjustable components on both ends and in the middle of the instrument. Both edges of the rule are ivory-lined, and scaled markings are engraved in the ivory. Rule has brass thumb-rolling mechanism.
Primary Materials: brass, wood, ivory
Engraved into wood is: “CHAS HEARN ROMAIN BDGS TORONTO”.
Height = 32.2cm X Width = 6.7cm X Length = 2.5cm
Used in navigation, cartography, drafting and astronomy.
fragile – damage to all components – See Condition Report for more information
Manufacturer: CHAS HEARN ROMAIN BDGS TORONTO
Date of Manufacture: c. 1900
University of Toronto Department of Astronomy and Astrophysics
Entry updated courtesy of information provided by R. A. Rosenfeld, M.A., M.S.L., Archivist, Royal Astronomical Society of Canada.
See also: A Descriptive Treatise on Mathematical Drawing Instruments… (London: the author, 1873), pp. 155-156; Maya Hambly, Les instruments de Dessin 1580-1980, tr. D. Bauthier (Paris[?]: Ars mundi, 1991 [orig. Engl. ed. 1988]), pp. 110 (fig. 103), 113.
Donated to UTSIC: No