Heron von Alexandria, Biographie, Erfindungen, Wissenschaft

Part 1

Heron from Alexandria (Heron Alexandrinus) was a Mathematician, Physicist and Engineer who lived in 10-70 AD but some references consider also 150 AD which is probably wrong, as in one of his works he referred to a recent eclipse which is now thought to have occurred in 13 March 62 AD. From Heron's writings it is reasonable to deduce that he taught at the Museum in Alexandria. His origin is uncertain although he wrote in Greek on the measurement of geometric figures and invented many contrivances operated by water, steam, or compressed air, including a fountain and a fire engine.

Image of Heron of Alexandria Of course this is not a real but a hypothetical portait of Heron!

Known as Michanikos, the Machine Man, Heron invented the world's first steam engine, developed some sophisticated surveying tools, and crafted handy gizmos like a self-trimming oil lamp. Technically speaking, Heron's clever inventions were particularly notable for their incorporation of the sorts of self-regulating feedback control systems that form the bedrock of cybernetics; like today's toilets, his "inexhaustible goblet" regulated its own level with a floating mechanism. But what really stirred Heron's soul were novelties: pneumatic gadgets, automata, and magic theaters, one of which rolled itself before the audience on its own power, cranked through a miniature three-dimensional performance, and then made its own exit. Another staged a Dionysian mystery rite with Apollonian precision: Flames lept, thunder crashed, and miniature female Bacchantes whirled madly around the wine god on a pulley-driven turntable.
Erik Davis - Techgnosis: Myth, Magic & Mysticism In The Age Of Information

Heron’s Books

· Automata (in Arabic Translation) (Greek: moving itself) (lat. De automatis). A collection of constructions called miracles (thaumata) for temples. Heron describes automatic rotating objectives, noise such as thunder, automatic opening doors. Philon from Byzanz describes the existence of automata in his book Mechaniki syntaxis, that includes pneumatic apparatus and automatic astronomical devices as early as 300 BC.

· Catoptrica geometric linear propagation of light, reflection, use of mirrors. A PDF File in German with reference to the Catoptrica.
· Dioptra (in Arabic Translation) (Greek word for a instrument to see through). A collection of constructions for the determination of lengths from a distance. Heron describes constructions similar to the Theodolit used for measurements of angles and other devices such as the odometer used to measure distances.

John F. BROCK in Pyramids to Pythagoras: Surveying from Egypt to Greece – 3000 B.C. to 100 A.D. gives a description of the content of Heron's Dioptra book:

1) and 2) Introduction to “the science of dioptrics”.
3) and 4) Instructions on how to construct a dioptra instrument.
5) Instructions on how to produce a stave for measurement.
6) To observe the difference in height between two points or if their height is the same.
7) To draw a straight line by dioptra from a given point to another invisible point, whatever the distance between them.
8) To find the horizontal (pros diabeten) interval between two given points, one near us, the other distant, without approaching the distant one.
9) To find the minimum width of a river while staying on the same bank.
10) To find the horizontal interval between two visible but distant points, and their direction.
11) To find a line at right angles at the end of a given line, without approaching either the line or its end.
12) To find the perpendicular height of a visible point above the horizontal plane drawn through our position, without approaching the point.
13) (a) To find the perpendicular height of one visible point above another, without approaching either point. (b) To find the direction of a line connecting two points, without approaching them.
14) To find the depth of a ditch, that is the perpendicular height from its floor to the horizontal plane either through our position or through any other point.
15) To tunnel through a hill in a straight line, where the mouths of the tunnel are given.
16) To sink shafts for a tunnel under a hill, perpendicular to the tunnel.
17) To lay out a harbour wall on a given segment of a circle between given ends.
18) To mound up the ground in a given segment of a spherical surface.
19) To grade the ground at a given angle, so that on a level site with the shape of an equal-sided parallelogram its gradient slopes to a single point.
20) To find a point on the surface above a tunnel so that a auxiliary shaft can be sunk.
21) To lay out with the dioptra a given distance in a given direction from us.
22) To lay out with the dioptra a given distance from another point, parallel to a given line, without approaching the point having the line on which to lay it out.
23) to 30) The first five chapters refer to the dioptra setting out irregular shaped plots of land, while the remaining three explain how to determine the areas from those figures.
31) To measure the discharge or outflow of a spring.
32) and 33) Describes how to utilize the dioptra in a vertical mode for the purposes of astronomical observations.
34)This chapter informs the reader about the usage of another measuring instrument called the odometer, which has a device fitted to the wheels of a carriage such that the horizontal distance is evaluated in a very similar fashion to which a modern day perambulator gives distance

LEWIS, M.J.T., Surveying Instruments of Greece and Rome, (Cambridge University Press, 2001)

· Metrica (in Arabic Translation) A collection of 3 books for the determination of areas and volume of objectives. Part 1 considers the area of triangles and other polygons with 4-12 sides, Surfaces of pyramids, cylinders, spheres etc. Part 2 considers the volume of sphere, cylinder, prisms, pyramids etc. Part 3 considers the division of areas and volumes in parts. He gives a method fort he determination of the cubit root and calculates the cubic root of 100.
· Pneumatica (Spiritalia) Two books, A collection of around 80 mechanical apparatus, that work with air, steam or hydraulic pressure. This includes a fire extinction apparatus, automata that provide water if a coin is inserted and the first steam engine (Aeolipile). The Heronball, Thermoscope, Syphon, Fontain, and Aeolipile. 1899 Edition in Greek
· Belopoeica A Collection of war machines. The original manuscript did nor survive but medieval handwritten copies exist. 1918 Version in Greek
· Mechanica 3 Books of how to move heavy objects. Part 1 provides the basis of statics and dynamics. Part 2 shows 5 simple machines. Part 3 describes lifting machines and pressures. Mechanica 1999 Edition

Other books possible also from Heron are

· Geometrica A collection of equations and exercises based on the first chapter of Metrica.
· Stereometrica. Examples of three dimensional objectives based on the second Metrica Chapter.
· Mensurae. Objects that can be used for measuring based on Stereometrica and Metrica.
· Cheirobalistra. (xeiroballistrwn kataskeuh kai summetria.) A Part of a lexicon about Catapults.

Heron’s Aeolipile (Wind or Steam ball)