How did the coin's action in Hero's machine differ fundamentally from early 20th-century machines like Leverett's?

Answer

Hero's coin acted as a temporary trigger that slid off, whereas later machines were designed to retain the coin as revenue.

Hero’s machine used the coin as a temporary operational trigger that slid off the lever before the flow stopped; subsequent early 20th-century machines were often designed to keep the coin as revenue.

How did the coin's action in Hero's machine differ fundamentally from early 20th-century machines like Leverett's?
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