Scientific American, Vol. 32, No. 4 (1875)
Scientific American volume 32, number 4, published in 1875, is a weekly American periodical of mechanical and scientific news that printed technical diagrams for engineers, inventors and general readers. The pictures are black-and-white engravings of machines and apparatus, drawn in clean outline with cross-hatched shading, labelled with Fig. numbers and letter keys, offering a designer examples of precise technical line work and labelled diagram layout.
