But that typewriter proved to me that I had a pipe-stem for a back.

Also, it made me doubt my shoulders.

They ached as with rheumatism after every bout.

The keys of that machine had to be hit so hard that to one outside the house it sounded like distant thunder or some one breaking up the furniture.

I had to hit the keys so hard that I strained my first fingers to the elbows, while the ends of my fingers were blisters burst and blistered again.