The Journal of the Royal Astronomical Society of Canada 1918-07: Vol 12 Iss 6
An issue of the Royal Astronomical Society of Canada's scholarly journal, published in Toronto in July 1918 for society members and working astronomers. The plates are engraved mechanical drawings of telescope and spectrograph apparatus, shown in plan and elevation with lettered parts, thin ruled hatching and sectioned bolts, castings and tubes — useful as technical line diagrams and instrument silhouettes.
