The force pump was widely used in the Roman world, and one application was in a fire-engine.The sound of thunder was produced by the mechanically-timed dropping of metal balls onto a hidden drum. Hero also invented many mechanisms for the Greek theatre, including an entirely mechanical play almost ten minutes in length, powered by a binary-like system of ropes, knots, and simple machines operated by a rotating cylindrical cogwheel.A wind-wheel operating an organ, marking the first instance in history of wind powering a machine.The pan continued to tilt with the weight of the coin until it fell off, at which point a counter-weight would snap the lever back up and turn off the valve. The lever opened up a valve which let some water flow out. When the coin was deposited, it fell upon a pan attached to a lever. This was included in his list of inventions in his book Mechanics and Optics. The first vending machine was also one of his constructions when a coin was introduced via a slot on the top of the machine, a set amount of holy water was dispensed.Hero's wind-powered organ (reconstruction) Much of Hero's original writings and designs have been lost, but some of his works were preserved including in manuscripts from the Eastern Roman Empire and to a lesser extent, in Latin or Arabic translations. In mathematics he is mostly remembered for Heron's formula, a way to calculate the area of a triangle using only the lengths of its sides. Some of his ideas were derived from the works of Ctesibius. In his work Mechanics, he described pantographs. He is said to have been a follower of the atomists.

Among his most famous inventions was a windwheel, constituting the earliest instance of wind harnessing on land. Hero published a well-recognized description of a steam-powered device called an aeolipile (sometimes called a 'Hero engine').

He is often considered the greatest experimenter of antiquity and his work is representative of the Hellenistic scientific tradition. 70 AD) was a Greek mathematician and engineer who was active in his native city of Alexandria, Roman Egypt. Hero of Alexandria ( / ˈ h ɪər oʊ/ Greek: Ἥρων ὁ Ἀλεξανδρεύς, Heron ho Alexandreus, also known as Heron of Alexandria / ˈ h ɛr ən/ c.

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