艺术家: Jacques Canivet
日期: 1733
博物馆: Naval Museum (Madrid, Spain)
术: 铜
该仪器用于识别地貌和大地测量的横向线条,后一指研究地貌和大小以及地表上或地上点的位置. 它有一个坚固的金属框架,上面有2个眼板,其水平的视线排列,使每个视线都与对方的镜头相对应. 上行区段有悬点和出羽线;下行区段有银弧,上行区段上刻有度增量. 当电线穿过比例尺的中心时,眼相机光学轴完全水平.
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