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HERO'S DIOPTRA

The "dioptra" devised by Hero is a portable surveying instrument for making accurate geodetic measurements. It measures azimuths, heights, lengths and angular distances.

CHOROBATES

Remarkable architectular and topographical instrument, predecessor of the present plummet, which was used to calculate the inclination of several surfaces, in topographic sightings. The instrument describes Heron from Alexandria in his work Peri Dioptras.