On Apr 7, 10:19*pm, "Ed Huntress" wrote:
"Jim Wilkins" wrote in message

I post here to practice writing clear explanations of technical
subjects. I have no trouble visualizing the motions and forces of
moving parts, enormous trouble converting that image into a linear
written description. One little paragraph takes an hour or two and
still doesn't sound right, but you guys aren't paying. In real life I
draw sketches or sometimes have to machine a model or prototype the
circuit I've proposed.

Jim Wilkins