The Dupuyer acantha. [volume] (Dupuyer, Mont.) 1894-1904, 1900-05-10

refuge chamber, to be built in connec-
ton with windows, which has many
meritorious features. The windows
case of fire, and in raising these drafts
are created, so that the flames and
smoke DON pour out of them, forcing
the unfortunate inmates who have
taken refuge on the sills either to lump
to their possible death below or to re-
main and be smothered or burned to
death. This chamber is formed of
shutters of iron or suitable non-in1am-
mable material, their design being
such that when the lower and upper
shutters are respectively raised and
lowered and the side shutters folded
in against them a smoke-proof cham
Der Is formed. In it one may take
refuge and remain until the firemen
have an opportunity to raise ladders
or stretch jumping nets. This arrange
ment effectually protects those who
have taken refuge in it until they are
rescued, unless, of course, the fire
should first destroy that particular
part of the building. The very fact
that the window is thus closed helps
materially in preventing the spread of
the flames. Besides, it is operated from
the inside of the building, and thus
forms a fire shutter that can be more
quickly placed in operation than shut
tiers on the outside of a building.
New Sound.
What tho inunntnr an1arsAaz - e.
new sound" is produced by a device
just patented by Prof. Elisha Gray.
This sound is produced by a method
OF ringing a bell by means of magnets,
and he claims that it is especially
adapted to submarine t~elegraphy. At
present bells are always rung by the
impact of a tongue, a hammer, or the
like, but In Prof. Gray's invention
there is no blow at all on the bell.
Briefly, the method consists in excit-
ing magnets in relation to a bell, with
currents of a frequency corresponding
to the distinctive vibratory rate of the
bell; the magnetic force thus tuned Is
caused by appropriate means to pro-
duce at regular intervals a reformation
of the shape of the bell, thus result
ing in its vibration. The receiver con-
sists of a stretched steel plate located
at a distance and tuned to respond to
the vibrations transmitted through the
water; a telephone attachment in turn
taking up the vibrations, which may
be broken in continuity to correspond
to the Morse code, and rendering them
audible in the ordinary telephone re-
ceiver. AS is we'll known, in sounding
a bell by can of a blow, much of the
energy applied is expended in setting
up Objectionable overtones. BY the
electromagnetic means proposed by
Prof. Gray, only such vibrations will
be set up as correspond to the normal
note of the bell, a pure tone thus being
produced. which, indeed, the inventor
calls "a new sound" The patent gives
no indication as to the distances
through which messages may be trans
mitted in the ann proposed, and
practical experiments on the system
will be looked forward to with much
interest. AS applied to the purpose
mentioned, the bell sounds only when
the speed of the alternater corresponds
to the normal vibratory rate Of the
bell, and a delicate governing attach
ment to the machine may be adjusted
until the sounding Of the bell indi-
Gates that the proper speed is secured.
after which the mechanism Is presum-
ed automatically to maintain such
speed.