Rolling Parallel Rule

Astronomy

Accession Number: 2012.ast.4

Description:

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.

Alternative Name:

Primary Materials: brass, wood, ivory

Markings:

Engraved into wood is: “CHAS HEARN ROMAIN BDGS TORONTO”.

Dimensions (cm):

Height = 32.2cm X Width = 6.7cm X Length = 2.5cm

Function:

Used in navigation, cartography, drafting and astronomy.

Condition:

fragile – damage to all components – See Condition Report for more information

Associated Instruments:

Manufacturer: CHAS HEARN ROMAIN BDGS TORONTO

Date of Manufacture: c. 1900

Provenance:

University of Toronto Department of Astronomy and Astrophysics

Additional Information and References:

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