The Journal of the Royal Astronomical Society of Canada July-August 1913: Vol 7 Iss 4
A bimonthly scholarly journal issued by the Royal Astronomical Society of Canada in 1913 for members and working astronomers, reporting observations, observatory equipment and meeting proceedings. The single indexed plate is a halftone photograph of a free-pendulum regulator clock in a tall glazed wooden case, showing the dial, weight and bob against a plain wall, useful as instrument silhouette, period horology reference, or coarse-screen halftone texture.
