The Greek Abacus (5th c. B.C.)Abacus was a wooden tablet with small pebbles used to calculate complex mathematical operations. Such an abacus, based on the acrophonic (Herodian) numeral system (e. g. to represent (ten), to represent (a hundrend), etc.), made of marble and dated from the 4th century B. C., was discovered in 1846 on the island of Salamis and is kept at the Epigraphical Museum of Athens. One or two sets of parallel lines equally divided by a vertical line are
The sender formed the message by passing a thin thread through the holes of the relevant letters and the receiver read it by removing the thread and noting the letters from right to left
The players were holding each by three pawns (of different colour or type such as black and white pebbles
152 if all symmetrical (by rotation
made of marble and dated from the 4th century B
This book revives approximately two hundred exceptional ancient Greek inventions (from the robot - servant of Philon to the cinema of Heron and from the automatic clock of Ktesibios to the analog computer of Antikythera) and aims to demonstrate that the technology of the ancient Greeks
while with any given latitude as a sundial
Thus it was created at the section points of the lines nine positions for the pawns
and the Olympiad
the development of which would be doubtful without its effortless and undemanding adoption
the height of a building)
in as many ways possible
The instrument could be used as a position locator at any given hour of the day
