SerialH
o,304,498.nited States Patent Office. the case the cy-
25 lindrical armature-machine the currents de
veloped the cylinder are taken off by
brushes applied the sides the cylinder at
its ends.
SPECIFICATION forming part Letters Patent No. vertical
section the same right angles the
shafts.
I would call attention the obvious fact 70
that the direction magnetism both
fields the same the same result above
will obtained driving the disks op
posite directions and crossing the connect
ing-belts.
BROWN, NEW YORK, Y.
This invention relates that class elec
trical generators known unipolar,” in
which disk cylindrical conductor is
mounted between magnetic poles adapted to
15 produce approximately-uniform field. this join bolts E
a casting with two similar and correspond
ing pole-pieces C'. 90
In order form frame with two fields of
force, cast support with two pole-pieces
B integralwith it.
ApplicationfiledM
arch23, 1889.
•I prefer construct the machine such
manner that the direction magnetism or
order the poles one field force oppo- 60
site that the other, that rotation the
disks the same direction develops current
in one from center circumference and the
other from circumference center.
NIKOLA TESLA, NEW YORK, Y.
The specific construction the machine
which have just generally described have
illustrated the accompanying drawings, 85
which—
Figure side view, partly section, of
my improved machine. The disks are
formed with flanges, after the manner pul- 55
leys, and are connected together flexible
conducting bands belts. In
the first-named disk armature machines the
currents induced the rotating conductor
flow from the center periphery, con
versely, according the direction rotation
20 the lines force determined the
signs the magnetic poles, and these currents
are taken offusually connections orbrushes
applied the disk points its periphery
and near its center. The pole-pieces 95
are wound connected produce field of
force given polarity, and the pole-pieces
C are wound connected produce., ASSIGNOR TWO-THIRDS TO
CHARLES PECK, ENGLEWOOD, NEW JERSEY, AND ALFRED S.
DYNAMO-ELECTRIC MACHINE. (H
om
odel,)
To all whom concern:
Be known that Nikola Tesla, from
' Smiljan, Lika, border country Austria-
Hungary, subject ofthe Emperor Austria,
S and resident New York, the county and
State New York,have invented certain new
and useful Improvements Dynamo Mag
neto Electric Machines, ofwhich the following
is specification, reference being had the
io accompanying drawings. Contacts
applied therefore the shafts upon which the 65
disks are mounted form the terminals a
circuit the electro-motive force which is
the sum the electro-motive forces the two
disks. this way the difficulty se- 75
curing and maintaining good contact with
the peripheries the disks avoided and a
cheap and durable machine made which is
useful for many purposes—such for ex
citer for alternating-current generators, for So
motor, and for any other purpose for which
dynamo-machines are used.
It has been proposed couple two more
40 disks together*in series with the object ob
taining higher electro-motive force; but
with the connections heretofore used and us
ing other conditions speed and dimension
of disk necessary securing good practicable
45 results this difficulty still felt seri
ous obstacle the use this kind gener
ator. These objections have sought avoid;
and for this purpose construct machine
with two fields, each having rotary conductor
mounted between its poles, but the same prin- 50
ciple involved the case both forms of
machine above described, and prefer to
use the disk form shall confine the descrip
tion herein that machine.
In order develop economically electro-
30 motive force available for practicable pur
poses, necessary either rotate the con
ductor very high rate speed use a
disk large diameter cylinder great
length; but either case becomes difficult
35 secure and maintain good electrical' con
nection between the collecting-brushes and
the conductor, owing the high peripheral
speed. 406,968, dated July 16, 1889. Fig
