How Pneumatic Tubes Work

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For someone who was born after, say 1992, it’s probably difficult to imagine, but there was a time when people didn’t have e-mail, cell phones or digital books on Kindle. Back in the late 1800s, people mainly communicated long distance by letter or telegram. Even telephones were still a novelty.

from Pocket http://electronics.howstuffworks.com/everyday-tech/pneumatic-tubes.htm
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