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alec McFrank

on 28 April 2010

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Transcript of Bicycles

Bicycles The Draisines were the Ancestores of the modern bike
Someone sat on it and pushed across the ground
with his legs. In the early 1860s the bike was taken to the next level
Pierre Minchaux added a mechanical crank design on
large front wheels. This was called the velocipede. After a scotsman known as
Thomas McCall developed the
Penny-farthing, which was the
first 'ordinary' bike. It had wheels with a spoked frameand solid rubber
around the tires. It was hard to ride because of
weight distribution issues which were fixed in the
Dwarf Ordinary which decreased wheel size. One JK Starley invented the chain drive which
allowed the pedals to not be attached
to the front wheel. Further innovations created a second bicycle craze
John Boyd Dunlop invented the first practical pneumatic tire
Soon after the rear freewheel was developed which allowed
bikes to coast. Bicycles were the main means of transportation before
the 20th century and cars. The bikes inthe 20th century allowed workers to get around town and also
allowed leisurly rides as bikes were 3 times easier and 3-4 times faster. They also symbolized freedom for woman. Susan B Anthony said that bikes have done more for the emancipation of woman than anything else. Bikes also led to advanced metalworking techniques for the frames and
other things and also led to mechaniation and mass production. It also suprisingly paved the way for Barbie. Early in development bikes also had legal requirments. Bikes were considered vehicles and the riders to be operators.
In the dark they needed to have front and rear lights but many also put reflectors on. Biking is still very popular today and produces no pollution
for the enviroment. They do require metals to produce and rubber for the wheels but overall they are much better for the environment than cars/ trucks
Full transcript