image leybourn_w_on_dialling_1700_pl_018_002
Image number: RS.18013
Credit: ©The Royal Society

Star-dial

Date

1690

Creator

Robert White (1645-1703, British), Engraver

Object type

Library reference

48603

Material

Technique

Dimensions

height (page): 290mm
width (page): 180mm

Subject

Content object

Description

A plate depicting an instance of ‘projective dialling', where an east and west dial is projected on to the stars. A frame is suspended on a decorative poll, and on the frame are numbered wires representing the hour lines. A man in left profile looks up to the frame, telling the time through where the stars fall on the lines.

Inscribed below: ‘Against Page 99 of the Ninth Tractate.’

Plate 18 from William Leybourn’s Dialling: plain, concave, convex, projective, reflective, refractive… (Black Swan, Pater-Noster-Row, 1690)

William Leybourn (1626-1716) British mathematician and land surveyor was not a Fellow of the Royal Society.

Associated place

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