...A small telescope that aims at a target point can be pointed in the desired direction using two axes, vertical and horizontal, and the direction can be read on the horizontal and vertical scales. A telescope that can be rotated freely around the horizontal axis was once called a transit, while a theodolite was used when it could be used on the bottom and could not be pointed straight up. In addition, the Japanese Industrial Standards (JIS) distinguishes between a transit when the angle scale is read using a magnifying glass and vernier, and a theodolite when the micrometer is used to optically magnify the angle scale. *Some of the terminology explanations that mention "theodolite" are listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…目標点を視準する小型望遠鏡を,鉛直,水平の2軸方式で目的の方向に向けることができ,その方向を水平目盛盤,鉛直目盛盤で読み取る構造になっている。望遠鏡を水平軸のまわりに自由にまわすことができるものをトランシット,下側でつかえるため望遠鏡が真上を向かないものをセオドライトtheodoliteと呼び分けていたこともあった。また,日本工業規格(JIS)では,角度目盛を読みとる方法が拡大鏡とバーニヤなどによるものをトランシット,測微計で光学的に拡大するものをセオドライトと区分している。… ※「theodolite」について言及している用語解説の一部を掲載しています。 出典|株式会社平凡社世界大百科事典 第2版について | 情報 |
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