When the key is depressed, it depresses a plastic device (the contact pusher), which enables electrical connections within the keyboard assemblies.
Here is a link that describes it well:
http://www.nshos.com/HammondPAGE6.htm
Back in HS, I played all of the musicals, usually on electric bass, but occasionally on trumpet. The orchestra was always conducted by the band director, and had a decent number of students. I had already been playing professionally, but there were some other students who were not quite there yet. There was one kid (Drew) who played everything meaning that he could honk a note or two on pretty much every single band instrument. His primary instrument was saxophone, so he was assigned the "REED 2" book. If I remember correctly, he was a bit emotional & frequently got into fights. He wasn't too bad of a player, particularly when he learned the music by rote.
For those who aren't familiar with wind players, they typically play multiple instruments, and the "REED 2" book might have the parts for clarinet, flute, sax, bass clarinet, etc., depending on the show.
Drew was ambitious, so he also began playing the "REED 3" book, and perhaps one other. As a result, he got to bring everything out. Not having proper instrument stands, he balanced his clarinet, sax, bass clarinet, bari sax, etc. on an assortment of school chairs. Between songs he would frantically change the books, and grab a new instrument. During one of the quieter dialog breaks, he happened to knock over one of the precariously balanced instruments, which knocked over another, making a massive clatter. He immediately screamed out "FUCK!" and scrambled to recover. The look on the band-leader's face was priceless. What a night. My sister & I still laugh about this.
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