Twentieth century hand-book for steam engineers and electricians with questions and answers; a practical non-technical treatise .. (1913)
Swingle, Calvin Franklin, 1846- [from old catalog] · Chicago, F. J. Drake & company · leaf 1074
armatureand is calculated by this rule: P. S. equals 3.1416 x D x E. P. M. where D is the di-iameter of armature in feet and E. P. M. is the revolution;of the armature per minute. The Dynamo 1045 hands of a watch when viewed from the commutator end ofthe machine; then the electro-motive forces… … Fig. 439 drum winding on a drum core. four coils and fourcommutator bars. for direct current
