Click to embiggen to a more readable size.
Here’s a (crappy cell phone) photo of the machine in question:
And here’s the force curve of the Selectric (Composer, but the mechanism is essentially the same in other Selectrics) keyboard:
Click to embiggen to a more readable size.
Here’s a (crappy cell phone) photo of the machine in question:
And here’s the force curve of the Selectric (Composer, but the mechanism is essentially the same in other Selectrics) keyboard: