by 12 in. engines.
The transverse traveling motion consists of gearing, chain, and
carriage on four tram wheels, with grooved chain pulleys, driven by
the second pair of 6 in. by 10 in. engines, and the longitudinal
traveling motion driven by the other pair of 8 in. by 12 in. engines.
The transverse beams are wrought iron riveted box girders, firmly
secured to the end carriages, which are mounted on four double flanged
steel-tired wheels, set to suit a 38 foot span.
[Illustration: IMPROVED OVERHEAD TRAVELING CRANE]
[Illustration: FIG. 2 SIDE ELEVATION]
[Illustration: FIG. 3 PLAN]
* * * * *
BEST DIAMETER CAR WHEELS.[1]
[Footnote 1: By Samuel Porcher, assistant engineer motive power
department, Pennsylvania Railroad. Read at a regular meeting of the
New York Railroad Club, Feb. 19, 1891.]
It goes almost without saying that for any given service we want the
best car wheel, and in general it is evident that this is the one best
adapted to the efficient, safe and prompt movement of trains, to the
necessary limitations improved by details of construction, and also
the one most economical in maintenance and manufacture.
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