dioptra

n.

测量高度及角度用的一种光学装置；

INSTRUMENTACION PARA LA TOPOGRAFIA Y SU
“动姐”必须“动人”
Dioptra
Dioptra
Heron's Dioptra 35 and Analemma Methods: An Astronomical Determination of the Distance between Two Cities
Heron's Dioptra
When did Michael Psellus die? The evidence of the Dioptra : Byzantinische Zeitschrift
Uno strumento astronomico descritto nel corpus Archimedeo: la dioptra di Archimede.
A Detail of Heron's Dioptra
The scribes ancient copies of Dioptra by Philip Solitarius from Kirillo-Belozersky Monastery