In this way he eventually managed to put together an instrument by which it is possible to make minutely accurate angular measurements.
他的作品，就這樣拼湊出來﹘﹘已是一種可以做精密測定的量角儀器。國內工廠採用的量角器多是進口貨，體積大、功能有限，要量一個立體的、不規則的角度，往往需經過許多道計算手續，而劉保伸所發明的量角器，體積小、功能多、精密度高。