| 释义 |
macrometer|mæˈkrɒmɪtə(r)|
[f. macro- + -meter.]
An instrument for measuring distant or inaccessible objects.
1825W. Hamilton Handbk. Terms Arts & Sci., Macrometer, in Mathematics, an instrument contrived to measure the distance of inaccessible objects by means of two reflectors on a common sextant. 1888Encycl. Brit. XXIII. 126/1 Porro's telemeter, Elliott's telescope, and Nordenfelt's macrometer illustrate the principle. |