A text book of physics, for the use of students of science and engineering (1918)
Duncan, John, d. 1941, Starling, Sydney George, 1873- · London Macmillan · leaf 1017
Fig 931.—Magnetic field witharmature at rest. FIG. 932. -Magnetic field when currentflows in armature. in the armature, however, it produces a component of the magneticfield, perpendicular to that of the field magnets, and the resultantfield is as shown in Fig. 932. The brushes must now be placed…
Physics
Internet Archive · Gerstein Library, University of Toronto · Public Domain Mark 1.0. Free to use for anything.
