| According to archaeologists, the wheel was probably | | | | load a greater distance before the next roller was |
| invented around 8,000 B.C in Asia but the oldest wheel | | | | needed. |
| as we know it dates back to Mesopotamia in 3,500 | | | | 5) Eventually, the rollers were changed into wheels and |
| B.C. The invention of the wheel leading to today's | | | | in the process, the wood between the grooves of the |
| caster wheel Chicago, Illinois can be broken down into | | | | roller were cut away to form an axle and wooden |
| six stages: | | | | pegs were fastened to the runners on each side of |
| 1) Objects were placed on a roller similar to a log, used | | | | the axle. When the wheels turned, the axle turned in |
| to roll heavy objects easier. | | | | the space between the pegs and the first cart was |
| 2) Then they placed runners like a sled, under a heavy | | | | invented. |
| load to drag it and this was called, a sledge. | | | | 6) The cart's axle and wheels were made to move |
| 3) Later, the sledge and the roller were combined to | | | | separately and by 2000 B.C. the Egyptians made |
| move objects farther by alternating one roller with a | | | | chariots with spokes in the wheels. |
| second roller and repeating the process as they | | | | Of course today the wheel has undergone drastic |
| moved an object forward. | | | | transformation from a simple wooden wheel to wheels |
| 4) As the sledge runners wore grooves into the rollers, | | | | of various sizes and various materials to move loads |
| men realized that the grooves helped to move the | | | | from Point A to Point B. |