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Secondary sourcePaintingbetween 1877 and 1878

Hero Engine Illustration

Unknown · between 1877 and 1878

A nineteenth-century engraving from a popular science journal showing Hero's engine, an early steam-powered device attributed to Hero of Alexandria.

This illustration depicts Hero's engine, the steam-powered device traditionally attributed to Hero of Alexandria.

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Black and white line engraving of Hero's engine: a hollow sphere labeled a, with an upward pipe labeled H ending in a steam puff, supported on two bent pipes labeled L-C and G-F that rest on a circular basin labeled A and B with decorative scalloped rim and claw feet. Pipe K sits at the bottom.
Hero engine illustration, Popular Science Monthly, c. 1877-78.

About this source

What it is

This black and white engraving, published in Popular Science Monthly around 1877-78, illustrates the device known as 'Hero's engine': a hollow sphere connected by pipes to a basin, designed to demonstrate the power of steam.

Why it matters

Hero's engine is often cited as one of the earliest known examples of a steam-powered device, though it was built as a demonstration rather than a practical machine. This illustration, made many centuries after Hero's lifetime, shows how later scientists and illustrators tried to visualize and explain ancient inventions to a general audience.

Look closer

  • What does the diagram's labeling (letters like a, H, L-C) tell you about how the device worked?
  • Why do you think this device fascinated scientists writing in the 1870s?
  • How might this illustration differ from any device Hero himself actually built?

This painting is part of the curated material that grounds the AI version of Hero of Alexandria on Humy.ai — when students ask about related events, the AI can quote it and cite it.

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Manuscript page with Greek text in brown ink at top and bottom, and colored line drawings in the middle showing Hero's hydraulic bird-singing apparatus: several birds perched on pipes and arches, a tall cylindrical water vessel, a horizontal tank, and a bell-shaped weight on a chain.Book

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Pneumatica

Hero of Alexandria · 1st century AD (this copy later)

Page from a Greek manuscript showing a colored line drawing of a temple-like structure with columns, arches, and a dome-like roof, with hidden tanks and mechanisms below. Greek handwritten text fills the lower part of the page.Book

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Automata (Bacchus diagram)

Hero of Alexandria · 1st century AD (this copy later)

Painted miniature from a Greek manuscript: a bearded man with long grey hair in a golden-brown cloak extends his right hand toward the left, beside a dark archway. Red Greek lettering reads 'ΗΡΩΝ ΦΙΛΟΣΟΦΟ' beside him.Painting

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Hero of Alexandria in the Codex of Saint Gregory Nazianzenos

Unknown author · 9th century AD

Illuminated manuscript page with colored design drawing of a large siege engine or cannon in red, blue, green and tan, with a vertical arrow-like beam at top, surrounded by Greek text in brown ink on parchment.Document

Secondary source

Belopoiika (design drawing of a siege engine)

Hero of Alexandria · 1st century AD (this copy later)

Title page of a 1589 Italian book, engraved in black and white with an ornate architectural border of columns, scrolls and a central medallion. Printed text reads Di Herone Alessandrino De gli automati, ouero Machine se moventi, libri due, tradotti dal greco da Bernardino Baldi, with a small shield reading In Venetia, appresso Girolamo Porro, 1589.Book

Secondary source

De gli automati, ouero Machine se mouenti

Hero : Alexandrinus · 1589

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