Elementary lessons in electricity and magnetism
A school textbook on electricity and magnetism by Silvanus P. Thompson, revised by Otto H. L. Schwetzky and issued by Thompson & Thomas of Chicago in 1906 for beginning students. The 167 wood-engraved figures show coils, magnets, galvanometers, balances and circuit rigs on hatched bases, with lettered parts and arrows — usable as small line diagrams, instrument silhouettes and hatching textures.
