cogwheels - gearbox

Canon EOS 6D - f/14 - 1/30sec - 100mm - ISO 200

 

I borrowed this from my garage keeper, it is a part of the gearbox of a Alfa Romeo 156 2L Challenge car

 

- second choice for challenge Flickr group 'Macro Mondays', theme: 'Cogwheel'

- measure reference: the ring on the right is 8cm diameter

 

History/Invention of the cogwheel/gear :

- Early examples of gears date from the 4th century BC in China (Zhan Guo times – Late East Zhou dynasty), which have been preserved at the Luoyang Museum of Henan Province, China.

 

The earliest preserved gears in Europe were found in the Antikythera mechanism, an example of a very early and intricate geared device, designed to calculate astronomical positions. Its time of construction is now estimated between 150 and 100 BC.

 

Gears appear in works connected to Hero of Alexandria, in Roman Egypt circa AD 50, but can be traced back to the mechanics of the Alexandrian school in 3rd-century BC Ptolemaic Egypt, and were greatly developed by the Greek polymath Archimedes (287–212 BC).

Done