If then cast iron is used, we will find that
we cannot make with it as large a wheel as we may determine is
desirable when steel is used. And just to follow this line out to its
close I will state here that we find that 36 in. seems to be the
maximum satisfactory diameter for cast iron wheels, because this size
does not give greater mileage than 33 in., costs more per 1,000 miles
run, and seems to be nearer the limit for good foundry results. On the
other hand, a 36 in. wheel rides well and gives immunity from hot
boxes--a most fruitful source of annoyance in sandy districts. It is
also easily applicable where all modern appliances under the car are
found, including good brake rigging. In all passenger service, then, I
would recommend 36 in. as the best diameter for cast iron wheels.
Next taking up steel wheels, a great deal might be said about the
different makes and patterns, but as the diameter of wheels of this
kind is not limited practically to any extent by the methods of
manufacture, except as to the fastening of the wheel and tire
together, we will note this point only. Tires might be so deeply cut
into for the introduction of a retaining ring that a small wheel would
be unduly weakened after a few turnings.
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