Chain
wheel
A chain running
over the wheels, B, B, is deflected by the idle wheel, D, causing a
longer length and weight of chain on that side in proportion to the
chain on the straight side A, and like the thousand and one others was
expected to go.
(Subsection 919, from
p.367)
From: Gardner D. Hiscox, M.E., Mechanical Appliances and Novelties of Construction (1927), Norman W. Henley Publ. Co.
In science it often happens that scientists say, 'You know that's a really good argument; my position is mistaken,' and then they would actually change their minds and you never hear that old view from them again. They really do it. It doesn't happen as often as it should, because scientists are human and change is sometimes painful. But it happens every day. I cannot recall the last time something like that happened in politics or religion. (1987) -- Carl Sagan
