Dynamos and motors; a text book for colleges and technical schools
A 1911 college and technical-school textbook on dynamos and motors by William S. Franklin and William Esty, published by Macmillan in New York for engineering students. Its figures are line diagrams of armatures, pole pieces and field lines, with lettered poles, dashed axes, angle marks and dotted current symbols: clean circular geometry, hatched coil bands and arrowed flux paths.
