One of Heron's intriguing inventions was a device known as …

One of Heron's intriguing inventions was a device known as a "clepsydra" or a water clock, but he also designed other types of devices that could manipulate liquids. The jug you mentioned is often referred to as Heron's "magic" or "mechanical" jug. This cleverly designed vessel could pour different liquids, such as water and wine, from the same container, depending on how it was tilted or handled.