| | The Development of the Dynamo (Site not responding. Last check: 2007-11-03) |
 | | Contributions to the general development of the dynamo were made by Field, Edison, Sprague and others; whilst a particularly important advance in armature winding was made by Z. Gramme, who in 1870 invented (or rather reinvented, following Pacinotti in 1860) the toothed-ring winding system for armatures. |
 | | discovered at Vienna that a dynamo of the Gramme type could also act as an electric motor and one was set in rotation when a current was passed into it from a similar machine. |
 | | The introduction of power distribution systems for electricity supply, the installation of land and submarine telegraph cables, and the use of electric traction for trains were among the major consequences of the rapid progress in electrical engineering during the latter half of the 19th Century. |
| campus.murraystate.edu /tsm/tsm118/Appendix/dynamo.htm (384 words) |