經緯儀與轉鏡經緯儀之名詞辨析

On the Terminology of Theodolite and Transit

「經緯儀」與「轉鏡經緯儀」之區別，源於測量儀器發展過程中對望遠鏡轉鏡能力與量測精度之不同要求。在歷史上，「transit」一詞常用以指稱具轉鏡能力之工程用經緯儀，而「theodolite」則多指精密測角儀器，兩者之用途與技術特性，在歷史發展過程中曾具有一定程度之差異。然而隨著儀器設計之演進，現代經緯儀幾乎均具備轉鏡能力，使得此一區別在技術上已不復重要。
儘管如此，「transit」一詞仍經常出現在測量教材與技術文獻之中，若未加辨析，容易造成理解上的混淆。就測量學術語而言，將「transit」譯為「轉鏡經緯儀」較能反映其原始技術意涵，亦可避免誤解為獨立於經緯儀之外的另一類儀器。本文所作之整理，期能作為閱讀測量文獻與撰寫技術文章時之參考。

The distinction between “theodolites” and “transit” stems from differing requirements for telescope transit capability and measurement precision during the historical development of surveying instruments. Historically, the term 'transit' was commonly used to refer to engineering theodolites with telescope transit capability, while 'theodolite' typically referred to precision angle-measuring instruments, with the two having certain differences in their applications and technical characteristics. However, with the evolution of instrument design, virtually all modern theodolites now possess transit capability, making this distinction technically no longer significant.
Nevertheless, the term 'transit' still frequently appears in surveying textbooks and technical literature, which can easily cause confusion if not properly differentiated. In terms of surveying terminology, translating 'transit' as 'transit theodolite' in Chinese better reflects its original technical meaning and helps avoid misunderstanding it as a separate category of instrument independent from theodolites. This compilation is intended to serve as a reference for reading surveying literature and writing technical articles.