a small point, the 'straight fork' (Fig. 1)
might not be a functional on the road fork at all, but rather a wheel
truing stand. These are still available to those of us who ride regularly,
and resemble forks. When wheels go over bad bumps, over time, the spokes
can loosen and the rim needs to be pulled back into shape. It is adjusted
in such a bracket with added measuring tools to detect wobble and roundness.
I don't know how this enters into the thinking about the bike wheel,
but I thought it might be useful to share. I am delighted to contribute
to anything Stephen Jay Gould had a hand in. His work has given me so
much pleasure and clarity of thought. Thank you.