這量角器是日據時期台灣總督府「民政局」（1896-1898）與「土木局（1903-1911）作為測量、製圖之用。

This protractor was used by the Civil Administration Bureau of the Taiwan Governor-General’s Office (1896-1898) and the Public Works Bureau (1903-1911) during the Japanese period for surveying and mapping purposes.