To see dot files, you must use the -a option to ls. The long form of -a is
-all, if you find that easier to remember. You can also use -A or
-almost-all, which displays all dot files except . and … Remember that .
is the current directory, and .. is the parent of the current directory;
because these are guaranteed to be in every directory, there is no real
reason to list them with ls. You already know they are there.
war-ships
The submarine signal system has also been applied to submarine
war-ships. By this means alone may a submarine communicate with
another, with a vessel on the surface, or with a shore station.
cells, and kites of this kind are largely used for
making scientific experiments
This type is remarkably stable, due to the small
cells, and kites of this kind are largely used for
making scientific experiments.
Secrecy is also attained by the use of tuning. It is possible that
another station may discover the wave-length being used for a secret
message and ‘listen in,’ but there are so many possible wave-lengths
that this is difficult. Secrecy may also be secured by the use of code
messages.
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needs of the fire-fighters
Another interesting application of wireless telegraphy is to the
needs of the fire-fighters. Fire stations in New York City have been
equipped with wireless telegraph sets, and they have proved so useful
in spreading alarms and transmitting news of fires that they seem
destined to come into universal use.
those tiny particles so arranged themselves that they would readily
carry a current between the plugs
Under the influence of the electric waves set up from the spark-gap
those tiny particles so arranged themselves that they would readily
carry a current between the plugs. By placing these plugs with their
platinum terminals in circuit with a local battery the current from
this local battery was given a passage through the coherer by the
action of the electric waves coming through the ether. While these
waves themselves were too feeble to operate a receiving mechanism,
they were strong enough to arrange the particles of the sensitive
metal in the tube in order, so that the current from the local battery
could pass through them. This current operated a telegraph relay which
in turn operated a Morse receiving instrument. An electrical tapper
was also arranged in this circuit so that it would strike the tube a
light blow after each long or short wave representing a dot or a dash
had been received. Thus the particles were disarranged, ready to array
themselves when the next wave came through the ether and so form the
bridge over which the stronger local circuit could convey the signal.
One young American, John Hays Hammond, Jr., has applied the wireless
in novel and interesting ways. By means of special apparatus mounted
on a small boat he can by the means of a wireless station on shore
start or stop the vessel, or steer it in any direction by his wireless
control. He has applied the same system to the control of torpedoes.
By this means a torpedo may be controlled after it has left the shore
and may be directed in any direction as long as it is within sight.
This invention may prove of incalculable benefit should America be
attacked by a foreign power.
