Wauwatosa news. [volume] (Wauwatosa, Wis.) 1900-1948, 1909-11-19

TOW HOW about the single track?" "'T1A
+hutolilatlc arrangement is the same onI,,
there is signal at each end '- o'li'
Ism IL a possible thing for a +r,+-
70 enter single track at one end "a
eLe same instant another enters ar r.
opposite end? What then?" NI'e
- issIout we have that taken care of
On double track, a train throngh ~ ~,
signal talks only to the train 6abf sIt7
ON the single track it not only +ai ~,
back, but also to one which NAV he 90 ~l,e9
ing from the opposite direction This il
done by the current oyerlannino[ f IS
one block to the next Before The - -''
trance TO a single-track block is reacba7
the traln sets stop signal at the "a
end on the block it is about to enter
And as it enters the block it also -.
the entrance signal to stop. inst as -
done on double-track" ID
How does an engineer know before ba
sees the home arm what it will signal ~
we put up another signal from q Lais
mlle 10 a mile from the entrance to
block-in the direction from which tba
train approaches. 1t is called 'Distan+G
Inc one at the entrance is called the
Home signal. The distant indicates t ~
position of home signal, seeg"
is the distant distinguished from tba
nome signal 10 aid the engineer"
yes, the Distant is painted yellow.
with black bar, and has forked end
the Home red, with white bar and
square end" '
You said a while ago the stop signal
is displayed only when something occurs
Anything but trains occurg'
Now you touch the most important
feature of the outfit and the princiDai
reason why the arm is made SO that
when left to itself it will stay firmly
at stop. AS it is constructed it cannot
snow anything but stop, unless the entire
combination of rails wire current mac
net etc, are working perfectly If a
Wire parts, a rail breaks, a battery falls
a switch point opens the slightest then
the combination fails, the arm is released
and resumes horizontal position The en-
gineer knows you see, when signal saws
stop; there may be train, an open
switch, break in the track or in the
signaling apparatus"
What is done at night, when the
semaphore arm cannot be SEEM"
Lights of several colors are used m
these same posts. These are seen through
spectacles in the butt or weighted end
of the arm, and are di played and Oh
scured according to the signal
why the name spectacle2"
That's what it is. The light is white
or ordinary flame color. supplied by an
eight-day lamp. 1t will burn eight DAYS
without replenishing, although all lamps
are refilled every four or five days When
the home signal is in stop position, the
engineer sees the flame through a red
glass. That's stop, and it is used only
IN the nome signals. If distant signal
is at caution he sees through yellow
glass. Yellow is used only in the distant
signal 1t tells the engineer it is the
distant, and to be prepared to stop at
the home signal. He may see through
green glass. That means proceed, and
is used in both home and distant signal"
What does white light mean?"
"Well, it is so easy to have we don't
dare use it. AS a white light on a sema-
phore can be displayed by breaking spec
tacle glasses, you can understand why
1t is impossible in our scheme"
How about places where two or more
lines cross at grader"
THE general principle. movements of
arm by day, and colors of light at night,
are the same, but being greatly compli-
Gated all signals are controlled by levers
operated by men from a central station
The crossing and contiguous tracks are
governed by the Interlocking system.
When in perfect order and unoccu-
pied it displays stop to every track APP
preaching the crossing. The block. you