diagraph 的詞源

"無需藝術技巧繪製物體的工具"，1847年； 見 dia- + -graph。

It consists of a carriage for a pencil governed by a system of cords and pulleys working at right angles to one another, and set in motion by the movement of a pointer, which is passed by the operator, who is careful to keep his eye at a fixed point of view, around the apparent outlines of his subject. The pencil describes on the paper the exact motions of the pointer, and thus reproduces the desired object. [Century Dictionary]

它由一個筆架組成，由一組相互垂直的繩索和滑輪控制，由操作者通過一個指針傳遞並保持視線在固定的視角上，沿着主題的表面輪廓移動。鉛筆在紙上描述指針的精確運動，從而再現所需的物體。[世紀詞典]

早期它的意思是“描述”（1798年）。