夜間用經緯仪測定浮标起点距时,往往因照明設备差、浮标目标小,不可能迅速地从鏡筒内找到浮标,以致測不到洪峯。川口流量站为了解决这一問題,将鏡筒上面之瞄准器(准星)涂上磷光粉,借其发光,在测流时先以瞄准器大致对准浮标,然后即可 Night with theodolite buoy determination from the starting point, often due to poor lighting equipment, buoy target is small, it is impossible to quickly find the buoy from the lens barrel, so that no peak measured. Kawaguchi flow station in order to solve this problem, the top of the barrel on the sight (sight) coated with phosphors, by its light, the flow in the first sight roughly aligned buoy, and then