5. ARMATURE WINDING SCHEMES. Lap Windings, Ring Windings, Wave Windings, Series Ring-Windings, Winding FormulÊ. Number of circuits. Equalizing connections. COLORED PLATES. 6. ESTIMATION OF LOSSES, HEATING AND PRESSURE-DROP. Copper Losses, Iron Losses, Excitation Losses, Commutator Losses, Losses through sparking. Friction and Windage Losses. Secondary Copper Losses. 7. THE DESIGN OF CONTINUOUS CURRENT DYNAMOS. Working Constants and Trial Values; Flux-densities; Length of Air-gap; Number of Poles; Current Densities; Number of Armature Conductors; Number of Commutator Segments; Size of Armature (Steinmetz coefficient); Assignment of Losses of Energy; Centrifugal Forces; Calculation of Binding Wires; Other procedure in design. Criteria of a good design. Specific utilization of material. 8. EXAMPLES OF DYNAMO DESIGN. 1. Shunt-wound multipolar machine, with slotted drum armature. 2. Over-compounded Multipolar traction generator, with slotted drum armature, with general specifications, tables, dimensions and drawings, fully described. A number of examples of generators are given in each chapter, fully worked out with rules, tables and data. VIII. ◊ 253 pages, 92 illustrations, 10 large folding plates and 4 THREE-COLOR PLATES, 8vo., cloth, $3.50. * * * * * Dynamo-Electric Machinery VOL. I.--CONTINUOUS CURRENT. BY SILVANUS P. THOMPSON, D.Sc., B.A., F.R.S. 7th Edition Revised and Greatly Enlarged. CONTENTS OF CHAPTERS.