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The Bicycle: From Wood To Metal.
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A bicycle is a two-wheeled, steerable machine propelled by its rider; the bicycle is said to be the most efficient means yet devised to convert human energy into propulsion. First made in the early 19th century, it developed as an important means of transportation and as the basis for a world-wide ....
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.... more, unlike so many other ideas, this one was actually built and used in practice. The essential principle was the transition from an intermittent (walking) to a continuous (rolling) movement, which greatly reduces energy consumption, since the body weight does not have to be raised with every step, as it is in walking.
Macmillan’s 1839
Copies of Von Drais machine were made in Britain by Denis Johnson and in America. Not until Kirkpatrick Macmillan, a blacksmith of Dumfriesshire, Scotland, c.... |
| Number of words: 1476 |
Approximate pages: 6 |
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