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120 ILLUSTRATED WORLD
SMALL TORCH PRODUCING
INTENSE HEAT
A SIMPLE device for obtaining intense
heat is made in this way:
Procure an old gallon bottle from a
druggist and a rubber stopper to accommodate
two glass tubes. Place the glass
tubing in their relative positions and
lengths, as shown, and connect
the shorter one to an
stove burner—one with
lating attachment—with
of rubber tubing.
old oil
a regua
piece
Now dilute some sulphuric
acid four or five to one,
and fill the bottom of the
bottle two or three inches
deep.
For the decomposing element,
use zinc. For the
best results it should be
treated in the following
manner:
Melt a quantity
metal until it flows
freely, then pour it
slowly into a basin
of water. The
resulting formations
are very thin
and have a large
surface to be
exposed to the
action of the
acid.
Now drop a
handful of the
"zinc drops" into
the bottle and
cork securely. If the burner is
closed, some of the liquid will
begin to rise in the glass tube.
After it has raised several inches, open
the burner until the acid in the tube
stops rising. When the gas issuing from
the burner is ignited, it will burn with an
intense, steady flame, that will melt all
common metals in quantities.
To obtain greater pressure shut off the
flame until the acid in the tubing has
reached a higher level.
MOVIES IN A SUITCASE
l_JERE is probably the lightest motionpicture
projector that yet has appeared.
It weighs but nineteen pounds
and may be carried about in a suitcase.
It may be operated from any electriclight
socket, either direct or alternating
current. All that is required to
start the operation is to put the
connecting plug in the socket and
press a button. It is equipped
with an incandescent lamp—an
innovation. It may be used with
lamps of 100, 250, 400, or 500
watts. As a consequence, it may
be readily operated in any church,
hall, or home, where electricity is
available. All the inconveniences
and perplexities of carbons and
rheostats thus are obviated. The
machine, which may be carried
from place to place already assembled,
need not be placed in a
carrying case, unless desired, so
light, compact, and wellconstructed
is it. A daylight
screen goes with the
machine so that it may be
operated in the daytime
by salesmen or others who
wish to make a demonstration.
In addition to
the advantages of such a
machine being of value
to the salesman, scientific
lecturer, or for h o m e
entertainment, it offers
the manufacturer an excellent
opportunity to have
made at relatively small cost a
record of the various processes
and motions required in his shops to perform
certain operations.