DIOPTER
Source: 567
{ Di‐op″ter (?), ‖Di‐op″tra (?), } n. [[L. dioptra, fr. Gr. �. See 2d Dioptric.]] An optical instrument, invented by Hipparchus, for taking altitudes, leveling, etc.
Source: 567
{ Di‐op″ter (?), ‖Di‐op″tra (?), } n. [[L. dioptra, fr. Gr. �. See 2d Dioptric.]] An optical instrument, invented by Hipparchus, for taking altitudes, leveling, etc.