[Controlcambios-list] 5, between the pump and the tender, and two usually in the p

Sun Dec 6 05:54:41 CET 2009

 of 60 miles an hour, that it would take to accomplish a mile at 30
miles an hour; but in the former case there would be twice the number of
miles accomplished in the same time, so that when the velocity of the
train was doubled, we should require an engine that was capable of
overcoming four times the resistance at twice the speed, or in other
words, that was capable of exerting eight times the power, so far as
regards the element of atmospheric resistance. We know by experience,
however, that it is easier to attain high speeds on railways than in
steam vessels, where the resistance does increase nearly as the square
of the speed. 502. _Q._--Will you describe generally the arrangement of
a locomotive engine? _A._--The boiler and engine are hung upon a
framework set on wheels, and, together with this frame or carriage,
constitute what is commonly called the locomotive. Behind the locomotive
runs another carriage, called the tender, for holding coke and water. A
common mode of connecting the engine and tender is by means of a rigid
bar, with an eye at each end through which pins are passed. Between the
engine and tender, however, buffers should always be interposed, as
their pressure contributes greatly to prevent oscillation and other
irregular motions of the engine. 503. _Q._--How is the framing of a
locomotive usually constructed? _A._--All locomotives are now made with
the framing which supports the machinery situated within the wheels; but
for some years a vehement controversy was maintained respecting the
relative merits of outside and inside framing, which has terminated,
however, in the universal adoption of the inside framing. It is
difficult, in engines intended for the narrow gauge, to
-------------- next part --------------
A non-text attachment was scrubbed...
Name: husain.jpg
Type: image/jpeg
Size: 9520 bytes
Desc: not available
Url : /pipermail/controlcambios-list/attachments/20091206/50fb423a/attachment.jpg