#history-of-technology

#history-of-technology

The coin would fall inside and land on a lever. Under the weight of the coin, the lever went down, pulling a string. The string was attached to a plug that opened a valve, allowing the container to dispense holy water. So Hero's invention was not a snack machine - it was designed to prevent people from taking more than their fair share of holy water, which had apparently been a problem in temples up to that point.

In 1860, Édouard-Léon Scott de Martinville created the phonautogram, an early sound recording device, which recorded sound vibrations but could not playback audio.