Powers of 10: record   Leave a comment

A long time ago, when the Earth was young, people would record sounds by scratching a sharp object across a soft piece of plastic (a ‘record’). The groove in the plastic was then tracked by another sharp object (a ‘needle’), and the movement of the needle was converted back into sound. By this mechanism, people could record music, spoken words, or just the environment around them.

Nowadays, we record sound digitally on highly polished discs. Those are boring to look at. Here’s a record:

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Posted December 9, 2010 by resnicklab in Uncategorized

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