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“晴雨计”卽为一“空盒气压表”,表上有气压值刻度,旁边附有晴,雨等字样,外界大气气压有变化时则表上指针移动,所指刻度卽表示该时气压值。其构造原理:一多层的金属盒,中为部分真空(卽中有少许空气),盒顶接槓桿通过槓桿作用连到指针,当外界气压变化时,空盒便收缩或膨胀而通过槓桿引起指针的移动,表示出外界的气压来。天气现象之变化(晴、阴、雨),会引起气压的改变,在某些情况下晴天时气压高,阴雨时气
“Barometer” is an “open box barometer” with a barometric pressure scale, with words such as clear, rainy, and the like. When the outside atmospheric pressure changes, the pointer moves on the gauge. The scale indicates the pressure at that time. value. Its construction principle: a multi-layered metal box with a partial vacuum (a small amount of air in the bowl). The box top-contact lever is connected to the pointer by lever action. When the outside air pressure changes, the empty box shrinks or expands and is caused by the lever. The movement of the pointer indicates the pressure of the outside world. Changes in weather phenomena (sunny, overcast, and rainy) can cause changes in air pressure. In some cases, the air pressure is high on sunny days and the air is cloudy during rainy days.