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graphometer

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Wiktionary英語版

出典:Wiktionary

graphometer

出典:『Wiktionary』 (2026/04/09 04:26 UTC )

語源

From grapho- +‎ -meter.

名詞

graphometer (plural graphometers)

  1. A surveyor's instrument for measuring angles.
    Synonyms: semicircumferentor, semicircle

ウィキペディア英語版

出典:Wikipedia

Graphometer

出典:『Wikipedia』 (2011/04/25 13:08 UTC 版)

英語による解説

ウィキペディア英語版からの引用
引用

The graphometer or semicircle is a surveying instrument used for angle measurements. It consists of a semicircular limb divided into 180 degrees and sometimes subdivided into minutes. The limb is subtended by the diameter with two sights at its ends. In the middle of the diameter a "box and needle" (a compass) is fixed. On the same middle the alidade with two other sights is fitted. The device is mounted on a staff via a ball and socket joint. In effect the device is a half-circumferentor. For convenience, sometimes another half-circle from 180 to 360 degrees may be graduated in another line on the limb.

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