The morning call., 1895-02-10
ELECTRIC BURGLAR


of electricity IN protecting property against
burglars has become familiar in many
ways. One OF the latest devices has been
which, when the surroundings are dis
turbed, takes picture silently of the in
truder This has worked very effectively
in several instances.
Another recent scheme for the protection
OF safe is its Enclosure in a metallic en-
velope, or casing, which does not touch the
safe, and is insulated from it, the envelope
having door opposite the safe door. The
envelope, or casing, rests on springs
mounted on insulating blocks on the top
of the safe, and depending from the en-
velope are top contact blocks, which strike
the safe and close an electric circuit
through an alarm when the springs are
compressed. There is also an outer en-
velope, which does not touch the in
mel. one, bllt. is in electrical circuit
with the safe, this envelope resting
on the floor, and also having a door oppo-
site the safe door. A spring near this door
acts as cirCuit-breaker when the door is
opened, and in case either envelope is
raised, it strikes either the safe or the other
envelope, closing the circuit and sounding
an alarm a battery beneath the safe, or
by one pole with the safe and the outer en-
velope, while its other pole connects with
the bell. a closed circuit battery is also
connected with contact lugs in the floor
which connect with the other envelope, a
wire leading from the other pole of the
battery to a cIrcult-cloSer composed of an
electro-magnet and a hinged armature,
normally resting on the magnet, but raised
by a spring when the circuit is broken.
When the circuit through this battery is
broken, the drop falls, and strikes upon
the free end of wires forming branches of
the open circuit wires, thus closing a
circuit through the bell and sounding an
alarm.
ELECTRICITY AND THE ETHER.-Professor
H. A. Rowland of Johns Hopkins Uni
versity has been discussing the rela-
tons between electricity and the ether.
AS is well known the general theory
to-day is that light, heat and cleo
tricity are but differing wave motions
of the ether, but there are many facts
vet needed for the confirmation of the pre-
vailing theoretical conceptions Professor
Rowland says of the ether and its nature
that it must be able to explain electrostatic
attraction, magnetic action the magnetic
rotation of polarized light in passing
through the magnetic field, the earth's
makes the striking statement that the
ether must be able to transmit to dis
lance an immense amount of energy, either
by means of electromagnetic waves as in
light or by the similar action which takes
place in the ether surrounding wire
carrying an electric current. The amount
of energy which can be transmitted by the
ether in this manner is enormous, far ex-
ceeding that which can be carried by any
thing composed of ordinary matter.
TREATMENT FOR ELECTRICAL SHocK.-The
French Minister of Public Works, under
expert advice, has prepared the following
rules in case of shock; The victim is first
of all to be taken into an airy place;
three or four persons should be there to
assist and no one else allowed to enter
The clothing is to be loosened and efforts
to be made to re-establish respiration and
circulation as soon as possible. To re-
establish respiration recourse can be had
TO the following two methods, viz: draw
ing of the tongue and artificial respiration.
In the former case the mouth of the victim
is opened, and if the teeth are clenched
they are to be opened with the finger or, If
there be resistance, with piece of wood,
the handle of knife, spoon or fork, or end
of walking-stick. The front part of the
tongue should then be taken between the