The spectroscope and its work
A popular science primer on the spectroscope and spectrum analysis by H. F. Newall, published in London by the Society for Promoting Christian Knowledge in 1910 for general readers. The plates are line diagrams of light rays, wavefronts, gratings and slits, with hatched shading, dashed construction lines and letter labels—useful as ready-made optical schematics and hatching textures.
