All About Inventions and Discoveries
The Romance of modern scientific and mechanical Achievements
Forfatter: Frederick A. Talbot
År: 1916
Forlag: Cassell and Company, LTD
Sted: London, New York, Toronto and Melbourne
Sider: 376
UDK: 6(09)
With a Colour Plate and numerous Black-and-White Illustrations.
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134 All About Inventions
the fall of pressure in the train pipe brought about
the immediate application of the brake upon the
vehicle near the point of escape, it was some time
before the pressure within the train pipe at the rear
of the train had fallen to an equal degree, thereby
bringing a corresponding braking effect to bear upon
the last vehicles.
The new improvement comprised a means of per-
mitting the escape of air to the requisite degree from
the train pipe beneath each vehicle almost at one
and the same time, and this is where the sensitive
valve plays its vital part. When the pressure is
released in the train pipe beneath the car immediately
following the locomotive, the quick-acting valve in-
stantly transmits the fall in pressure to the succeeding
car, causing a certain volume of air to escape from the
train pipe beneath that vehicle. The effect is then
handed on to the third car, when a similar result takes
place, and so on until the train pipe beneath the last
vehicle ejects its proportion of air. This serial trans-
mission takes place so quickly that it was found
possible, when another trial was made with the fifty-
wagon goods train at Burlington, to bring about the
full application of the brakes throughout the length
of the train in one-sixth of the time previously re-
quired ; while not only was the train brought to a
stop within a shorter distance, but even under emer-
gency or sudden braking conditions, bumping and
shocks were reduced to an almost insignificant degree-
These later trials with what was now described
as the “ quick-acting automatic brake ” made the
strongest appeal to railway officials. At last they
had been brought within reach of a device for which