But the City of Indianapolis came to the rescue. It bought the theater building in the 1980s and leased the Roof Ballroom to a developer, who not only fixed it up but installed what it called a scene machine to add more moody sky effects like synthetic snowfall.

VOA: standard.2010.02.25

Now this is a rain gauge, and it's sitting on a roof of a building, and when the water falls into this gauge, it sends a signal to the logic unit of the computer, which immediately notifies the memory bank of the computer to seek out its instructions for a rainy day.

这是一个雨量测量器，安装在一个楼房的,屋顶上，当水流入到这个测量器，它就给计算机的逻辑部件发送一个信号，计算机立即通知内存条,为下雨天找出相应的指令。

哈佛公开课 - 计算机科学课程节选