† macrometern.

Origin: Formed within English, by compounding. Etymons: macro- comb. form, -meter comb. form².

Etymology: < macro- comb. form + -meter comb. form². Compare earlier micrometer n. N.E.D. (1904) gives the pronunciation as (mæ̆krǫ·mĭtəɹ) /mæˈkrɒmɪtə(r)/.

Obsolete.

An instrument consisting of a sextant fitted with two reflectors, used for measuring the distance of an object from the observer.

ΘΚΠ

the world > physical sensation > sight and vision > optical instruments > instruments for measuring > [noun] > distant objects

macrometer1825

1825 W. Hamilton Hand-bk. 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.

1888 Encycl. Brit. XXIII. 126/1 Porro's telemeter, Elliott's telescope, and Nordenfelt's macrometer illustrate the principle.

This entry has been updated (OED Third Edition, March 2000; most recently modified version published online June 2018).

单词	macrometer
释义	† macrometern. Origin: Formed within English, by compounding. Etymons: macro- comb. form, -meter comb. form². Etymology: < macro- comb. form + -meter comb. form². Compare earlier micrometer n. N.E.D. (1904) gives the pronunciation as (mæ̆krǫ·mĭtəɹ) /mæˈkrɒmɪtə(r)/. Obsolete. An instrument consisting of a sextant fitted with two reflectors, used for measuring the distance of an object from the observer. ΘΚΠ the world > physical sensation > sight and vision > optical instruments > instruments for measuring > [noun] > distant objects macrometer1825 1825 W. Hamilton Hand-bk. 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. 1888 Encycl. Brit. XXIII. 126/1 Porro's telemeter, Elliott's telescope, and Nordenfelt's macrometer illustrate the principle. This entry has been updated (OED Third Edition, March 2000; most recently modified version published online June 2018). < n.1825
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