The Electrician
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TITLE: THE ELECTRICIAN
VOLUME“ISSUE“PAGES : 7a 70-71
DATE: 1914
AUTHOR OF ARTICLE: J.G. Balsillie
TITLE OF ARTICLE: THE BALSILLIE SYSTEM OF WIRELESS TELEGRAPHY AS
EMPLOYED IN THE RADIOQTELEGRAPH STATIONS OF THE
COMMONWEALTH OF AUSTRALIA
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70 THE ELECTRICIAN, OCTOBER 23, 1914.
less resistance through the secondary of the transformer than act
THE BALSILLIE SYSTEM OF WIRELESS, TELEGRAPHY the gap’as the potential of the reversed charge is not sufficient
break down the gap. (By this it is intended that ionization of
AS EMPLOYED IN THE RADIOTELEGRAPH STA- in the gap is not permitted to take place to any appreciable exten
TIONS OF THE COMMONWEALTH OF AUSTRALIA.* The result is, therefore, that the energy not absorbed from
BY J. G. BALSILLIE.
exciting cireuit by the radiator circuit and reversed in polarit
the single discharge of the exciting circuit finds its way to the
" The system of radiotelegraphy employed”athet various stations mary circuit via the transformer connecting the primary and chai
in the Commonwealth is a unidirectional impulse excitation ing cireuits, wherein it is again utilised.
system in which the radiator is excited into oscillation by the Briefly, the system is a means whereby a radiator is excited by
use of three cireuits permanently associated thereto, which’ three single impulse produced by the discharge of the condenser each log
tireuits and the radiator circuits fer the”purpose of definition are frequency period, arrangements being provided whereby t
portion of the energy not imparted to the radiator is returned to
source of power, means being provided whereby the return of ene!
from the radiator to the condenser is prohibited.
1
09
|
_ 08
mps. (Wave meter),
RAMS,
g
IN] a
°
Fie. 1.—ImaGe or pIscHaRGE IN Rorarrse Mimror.
520 609
F Speed of mirvor, 5,400 revs. per minute. Sparkj frequency, 360 per A- Metves.
sec. Wave length, 600 metres. The multiple imageis due to,the{thick-
Ss .uw @ wa Fie. 3.—Resonance Curve, Norman Rapirine Orci.
nessof the glass.
radiatt
termed the primary, the charging, the exciting and'radiator circuits. F In this system the tuning of the exciting circuit to the
The primary cireuit is connected to the charging circuit by meansfot circuit is resorted to for the purpose of insuring that the condens
a transformer, and arrangements are made that the electrical period discharge circuit shall deliver a portion of its original store of ener;
of oscillation of the charging circuit is in resonance with the forced to the radiator at such a rate that the radiator may most efficient)
period of oscillation of the primary circuit. The exciting circuit absorb it and after this has occurred there shall be no further actig
which forms part of the charging circuit is connected to the radiator or reaction between the radiator and the condenser dischar,
circuit by means of a condenser which is common to both circuits. circuit.
|
The balance of circuits is arranged so that there is noreaction between In respect of the single discharge in the exciting circuit the read
these circuits.» Inoperation the primary circuit charges the con- is referred to the photograph here reproduced (Hig. 1), which is take
densers, and the gap is so adjusted that the charge has reached its by means of a rotary mirror, and which shows a single dischar;
maximum before the condenser discharges across it. The discharge taking place during each period of the low-frequency circuit.
The system will be understood by the following deseriptio
is not oscillatory, for reasons which are explained later, but a single to Fig. 2, the frequency of the current taken from
discharge. This single discharge reverses the charge on the con- Referring
os | tT
04: |
|
303 —~
= | '
6EO n't
& . | a
«||
SOL
Bs
5 |
400 £00
A-Meires.
Fie. 4.
Curve I. Exciting circuit with spark-coil excitation.
ed as in Curve
» IL Radiation circuit with exciting circuit energis
second, B is
rotary converter A is approximately 350 periods per
ordinary choke coil with a movable core. The transformer ©, D
Fie. 2.—Diacram or CowN@orions oF THE BaLsILLie SystEM. an open magnetic circuit transformer with leakage factor of
later. The gap
A=a rotary converter, B=a choking coil for adjusting load, C=the definite value for a reason which will be explained
primary of @ special transformer with high leakage factor, D=the B js air-cooled with the object of preventing the format
ion of an at
secondary of this transformer, E=the spark gap, F, G, H=condensers, [=a Air at the pressure of approximately 100 Ib. per
square inch
ance
spiral choking coil, J ==inductance in the exciting circuit, K-=-induct electrode,
in the aerial circuit. blown through one electrode, and impinges on the other
The condensers F and:
the diameter of the orifice being about ¢zin.
1 per cent. of
densers. It is evident that the reversed charge cannot be of the G consist each of five jars, each having a capacity within
Tis the chokin:
same value as the original charge, because a certain part of the 0-00% mfd, The condenser H consists of L4such jars.
able impedan
energy of the original charge has been absorbed by the radiator, and coil of such value that it does not offer any appreci
tive impedan
on account of the charging circuit being in resonance with the to the flow of the 350 period current, but offers prohibi
with the path
primary circuit the reversed charge in the condensers finds a path of to the flow of an oscillatory current as compared
through H. J is a small tuning inductance; K is also a tuning
* Paper read before Section G of the British Association at Sydney.
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