is, before stated, approximately one-
quarter the wave length the electrical
disturbance the secondary circuit, based
on tire velocity propagation the elec-
30 trical disturbance through the coil itself, and
the circuit with which designed be
used—that say, the rate which a
current traverses the circuit, including the
coil, one hundred and eighty-five thousand
35 miles per second, then frequency nine
hundred and twenty-five per second would
maintain nine hundred and twenty-five sta
tionary waves circuit one hundred and
eighty-five thousand miles long, and each
40 wave length would two hundred miles in
length.
45 Coilsof the characterherein described have
several important advantages. Mart ling.
I aware that induction-coil the 65
form flat spiral not itself new, and
this not claim; but
What claim invention is—
1. system for the conversion and trans- 90
mission electrical energy, the combination
of two transformers, one for raising, the other
for lowering, the potential the currents,
the said transformers having one terminal of
the longer fine-wire coils connected line, 95
and the other terminals adjacent the
shorter coils electrically connected therewith
and the earth, set forth. transformer for developing convert
ing currents high potential comprising a
primary and secondary wound the form of
a spiral, the secondary being inside of, and 85
surrounded by, the convolutions the pri
mary and having its adjacent terminal elec
trically connected therewith and with earth
when the transformer use, set forth.
In practice for apparatus designed for or
dinary usage the coilis preferably constructed
on the plan illustrated Fig. Lawson er,
G.
Instead winding the coils the form of
a flat spiral the secondary may wound on
a support the shape frustum cone
and the primary wound around its base, as
jo shown Fig.
NIKOLA TESLA. transformer for developing convert- 75
ing currents high potential, comprising a
primary and secondary wound the form of
a flat spiral, the end the secondary adja
cent the primary being electrically con
nected therewith and with earth when the 80
transformer use, set forth.
3.
As the secondary electrically connected
with the primary the latter will sub
stantially the same potential the adjacent
portions the secondary, that there will 5s
be tendency for sparks jump from one
to the other and destroy the insulation.
4.
2o The inner terminals the secondaries are
led out through tubes insulating material
M, while the other outside terminals are
connected with the primary.
Witnesses:
M. For such frequency should use a
secondary fifty miles length, that one
terminal the potential would zero and at
the other maximum.
Moreover, both primary and secondary are
grounded and the line-terminal the coil
carried and protected point remote from 60
the apparatus the danger discharge
through the body person handling ap
proaching the apparatus reduced mini
mum.593,138
í>
veniently represented supplying tlio pri
mary the sending step-up” trans
former, and lamps and motors are shown
as connected with the corresponding circuit
5 the receiving step-down transformer. the po
tential increases with the number turns
the difference potential between adjacent
turns comparatively small, andhence very
50 high potential, impracticable with ordinary
coils, may successfully maintained.
The length the secondary coil of
25 each secondary coil when two are used, in
Fig. The primary
C spirally-wound flat strip surrounding
both secondaries B. 2. transformer for developing convert
ing currents high potential, comprising 70
primary and secondary coil, one terminal of
the secondary being electrically connected
with the primary, and with earth when the
transformer use, set forth. this fig
ure are spools insulating material upon
15 which the secondary wound—in the present
case, however, two sections, con
stitute really two secondaries.
.
2
