在钟表还没有发明的年代时,欧洲人用砂漏计时。它的制作方法是把砂粒充入一端玻璃球瓶内,中间连接一根玻璃细管,另一端玻璃球瓶在吹制时封闭起来,最后用框架支托住就成了。计时时充满砂粒的一端朝上,让砂粒慢慢漏入下面的玻璃瓶内(图1)。这样从玻璃瓶刻度上就可看出已过的时间,下面玻 In times when the clock had not yet been invented, Europeans used hourglass timers. Its production method is to fill the sand into one end of the glass ball, the middle connected to a glass tube, the other end of the glass ball bottle closed during the blowing, and finally with a frame support to become. When timed, the sand-filled end is facing upwards, allowing the sand to drain slowly into the glass below (Figure 1). In this way, the elapsed time can be seen on the scale of the glass bottle.