Rivista di astronomia e scienze affini, 1911, a. 5, n. 08 (August)
An 1911 Italian astronomy journal issue from the Società astronomica italiana and the Turin observatory, aimed at astronomers and students of the subject. The four pictures are geometric diagrams: celestial sphere projections with labelled zenith, pole and arc lines, a sightline sketch with angled rays, and a circle construction with tangent lines, drawn in fine black line on cream paper, useful to a designer for technical line schematics.
