Electric transmission of energy and its transformation, subdivision, and distribution. A practical handbook
Gisbert Kapp's practical handbook on electric power transmission, transformation and distribution, issued in New York by Van Nostrand in 1894 for engineers and electricians. The line engravings are schematic: ring armatures wound with hatched coil bundles, numbered commutator segments, radial brush and field-pole diagrams, labelled angles and vectors, all drawn as thin black line on tinted paper.
