White Pine news weekly mining review. [volume] (East Ely, Nev.) 1910-1920, 1911-04-16

w. X. FREUDENBERGER, CHIEF
ELECTRICIAN At BIG WORKS,
APPLIES FOR LETTERS PATENT
ON HEATING APPARATUS.

The Electrical World, one of the
leading journals of its class. published
in New York, in its issue of April =,
has given considerable space to tae
invention of an eleetric-heating ap-
paratus perfected by w. K. Freuden-
berger, the well known electrician in
charge of the electrical works It the
smelter in McGill. The article H. the
Electrical World is supplemented with
cuts and diagrams fully illustrating
its principles and workings. ana
therefore only a portion of the arti lie
can be used in these columns, but will
no doubt be of interest to the people
of the district. The article in regard
to it is as follows:
In a new line of electric heating
apparatus devised by Mr.. w. X.
Freudenberger of MeGill, New, the
resistance wire heating element is re-
placed by a solid piece of plate brass
in which large secondary eddy cur
rents are set up by transformer ac-
tion from a primary winding and core
The brass plate stamped in The form
required, usually annular or rectan-
gular. is quite in~destructible under
conditions of ordinary use. In apply
ing the transformer principle the
body of the appliance is made of
iron or steel and constitutes the mag
mel circuit of the transformer. The
primary coil is placed in 4 protected
position. separated from the second
airy ring, which is the heating ele-
ment, and may be wound Nth en-
ameled or asbestos covered COPPER
wire. designed for the ordinary ser
vice voltage. The iron or steel body
may be a solid casting, stamping or
punching, because the usual hyster-
esis and e~ddy-current losses are not
losses in this case. but are tntireiy
converted into useful heat.
The principle is clearly shown in
a section sketch of a melting pot for
melting solder. babbitt metal, glue.
wax. lead and other materials. ard
for heating soldering irons placed in
melted solder or other metal.
The heating element is very thir.
has a largo surface in immediate co..
tact with the bottom of the metal
pot and requires no insulation. Sc
that the heat is rapidly communica-
ted TO the part to be heated. A hien
efficiency is thus obtained becaGse
there is less chance for lateral radia-
ton. On account of the extremely
low potential developed I'm the second
airy or heating element il Is not shof,
circuited by being placed in contact
with the metal pot.
Ample thermal insulation is plac-
ed beneath the heating element, and
around the pot. to retain the heat
and thus increase at the junction OF
the pot and base and these parts are
bolted together through the 1anges
instead of by using tap bolts through
the base.
Fig. , shows how the principle is
applied 10 an iron. From this il is
clearly seen how very near the center
of the heat element is the surface of
application of the heat. The cleo
trie stove Is made generally similar
to the iron. except that IL is virtually
turned bottom up and set on legs.
The same principle is utilized in i'm
mersion heaters. curling-iron heat
ers, coffee pereolators and other APP
paratus. On account Of the heat
elements being practically hides
traetible very high temperature may
be used when desirable and quick
work may be done. A patent has
recently been applied for by Mr..
Freudenberger on the principle in
volyed in this innovation in electric
heating appliances.