Recently Rev. Paul put up a collection of very interesting historical photographs on his blog. Here are a couple of examples.
Eiffel Tower under construction, 1880's
Rollerskates, circa 1910
There are many more images at the link. Worth visiting.
Peter
it looks like those "skates" have some sort of linkage to apply a rotary moment to the wheels, as they are pushed up and down by the foot. Very cool!
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