| |
| |
Plough - Encyclopedia, History, Geography and Biography (Site not responding. Last check: 2007-10-10) |
 | | Ploughs are also used by industry underseas, for the laying of cables, as well as preparing the earth for side-scan sonar in a process used in oil exploration. |
 | | Ploughs were initially pulled by humans, later by oxen, and later still in some countries, by horses. |
 | | On a vehicle such as a tram, a plough is also the name commonly given to the pair of shoes, one pick-up and one return, both attached to a busbar, that draw power from a pair of live rails underneath the road. |
| www.arikah.com /encyclopedia/Plow (1652 words) |
|