double purchase gearing, with grooved drum, treble best iron chain
with block and hook, driven by one pair of 8 in. 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