is right. But as
steel-tired wheels usually become 3 in. smaller in diameter before
wearing out, the wheel should be about 38 in. in diameter when new.
Such a wheel can be easily put under all passenger cars and will not
have become too small when worn out. A great many roads are using 36
in. wheels, but when their tires have lost 3 in. diameter they have
become 33 in. wheels, which I think too small.
There are many things I have left unsaid, and I am aware that some of
the members of the club have had most satisfactory service with 42 in.
wheels so far as exemption from all trouble is concerned, and others
have never seen any reason for departing from the most used size of 33
in.
One more word about lightness. A wrought iron or cast steel center, 8
or 9 light spokes on a light rim inside a steel tire, makes the
lightest wheel, and one that ought to be in this country, as it is
elsewhere, the cheapest not made of cast iron.
* * * * *
A NEW INTEGRATOR.[1]
[Footnote 1: A paper read before the University College Engineering
Society on January 22.--_Engineering_.]
BY PROFESSOR KARL PEARSON, M.A.
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