Dioptra
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A dioptra is a classical astronomical and surveying instrument, dating from the 3^rd century BCE. The dioptra was a sighting tube or, alternatively, a rod with a sight at both ends, attached to a stand. If fitted with protractors, it could be used to measure angles.

Use

Greek astronomers used the dioptra to measure the positions of stars; both Euclid and Geminus refer to the dioptra in their astronomical works. By the time of Ptolemy (2^nd century CE), it was obsolete as an astronomical instrument, having been replaced by the armillary sphere.

It continued in use as an effective surveying tool. Adapted to surveying, the dioptra is similar to the theodolite, or surveyor's transit, which dates to the sixteenth century. It is a more accurate version of the groma.

The dioptra may have been sophisticated enough, for example, to construct a tunnel through two opposite points in a mountain. There is some speculation that it may have been a used to build the Eupalinian aqueduct, "one of the greatest engineering achievements of ancient times," a tunnel 1,036 meters (4,000 ft) long, excavated through Mount Kastro on the Greek island of Samos, in the sixth century BCE. Scholars disagree whether the dioptra was available that early.

An entire book about the construction and surveying usage of the dioptra is credited to Hero of Alexandria (also known as Heron; a brief description of the book is available online; see Lahanas link, below). Hero was "one of history’s most ingenious engineers and applied mathematicians."

The dioptra was used extensively on aqueduct building projects. Screw turns on several different parts of the instrument made it easy to calibrate for very precise measurements

The dioptra was replaced as a surveying instrument by the theodolite.

References

• Lucio Russo, The Forgotten Revolution: How Science Was Born in 300 BC and Why It Had To Be Reborn, (Berlin: Springer, 2004). ISBN 3-540-20396-6.
• Evans, J., (1998) The History and Practice of Ancient Astronomy, pages 34-35. Oxford University Press.

See also

• Alidade

External links

• Heron's Dioptra 35 and Analemma Methods: An Astronomical Determination of the Distance between Two Cities
• History of Measurement
• The Tunnel of Samos

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