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THE HARTFORD HZRALO
THATS how eay it is to
1 par for Corona. the
you can fold npj talc with
mm writ with anywhere.
Phone us today lor Ire
O. O. CROWE,
Afent . Hartford, Ky.
EYES EXAMINED FKEE!
S mai4 double rk
lauc while von wait.
Come to m ud mtt.
tiUte my wood r rial
frectcle work. I
2 to W. TH'O SI.
JOHN L DUNLAP 4 CO.
STOCKS AND BONDS
PUVATI VIM TO AU HAIKFTS
lit mt tm sn, . muraii, it
Convenes first Monday in March,
May and JuJy; third Monday In
September and fourth Monday In
Each term continues 12 juridical
Judge George s. Wilson, Owens
boro. Com'th. Attorney Glover H. Cary,
avCierk Frank Black.
Master Commissioner B. H. Ellts.
Truatee Jury Fond L. B. Tichenor.
Convene first Monday In each
Judge R. R. Wedding.
County Att'y. Otto C. Martin.
. Clerk Guy Ranney.
Sheriff O. A.. Ralph; Deputies
Mack Cook, Iris Render, George
Jailer Nathaniel Hudson..
Judge- R, R. Wedding.
Convenes first Monday in each
Convenes Tuesday after first Mon
day In January; first Tuesday in
April and October, . the County
, Art. District J. P. McCoy. Hart
ford. 2nd. District W. C. Knott, Center
town. Srd. District Q. B. 'Brown, Sim
4th. District J. R. Murphy . Fords
vllle. Bin. District Sam H. Hoi brook,
Hartford. R. F. D. No, 4.
0th. District Mack Martin, Nar
rows, R. F. D. No. 2.
7th. District J. Walter Taylor, Bea
ver Dam, R. F.D. No. 3.
HOARD OF EDUCATION
Buperinto' dent Mrs. I. S. Mason
Convenes first Monday In every
month.-Mrs. I. 8. Mason, 8. S. O. C,
nd ex-official Secretary-Treasurer,
R. A. Owen. Chairman, Hartford, R.
r. D. No. .
W. R. Carson, Vice Chairman, Hart
ford. R. F. D. No. .
Nat LIndley, Centertown, R. F. D.
Otis Steveus, Beaver Dam.
'Claud Renfrow, Dundee. .
For Common ' School Diplomas
Fourth Friday and Saturday la
January, and Second Friday and Sat
urday in May. Held In Fordsville,
Beaver Dam and Hartford.
' For TcuchciV tVrtiftcat Third
Friday and Saturday in May, June
and September. Except notice la
given to the coutrary the latter ex
aminations are held in Hartford.
BOARD OF DRAINAGE
8. T. Barnett. Hartford. Presidents
V. C. Kocker, Beaver Dam, R. F.,D.
Ho. i. aid J. A. Bellamy, wanes-
ville, R. F. D. No. I. .
Tax Cniiwltonpi P. V Keiiwo,
Surveyor !. a. Moxley, Fordsville.
Stepnaent ilve Ir Jones. White
ALL ABOUT VACUUM
TUBE AS AMPLIFIER
Connected Up to Furnish Rated
Filament Current and Main
tain Plate Potential.
Figure XXIV shows a three-electrode
vacuum tube connected with the
"A" battery to furnish the rated fil
ament current and a "B" buttery to
maintain rated plate potential. In
the piste circuit Is a current meter to
read the 'plute current. A "0" bat
tery la connected In the crld circuit
to maintain tin- grid at the poKitive
potential OA in order to have the
tube operate ut the point A on the
characteristic curve. To T-T will be
connected the alternating difference
of potentlul liuving a maximum pos
itive value equal to A-O and a max
imum negative value equal to A-B.
The resulting varlutlon In plate
current Is shown in Fig. XXV. In
serting the tube functioning as an
amplifier, with an amplification fao
when ni Increase, 7.1 must decrease.
This meuns thut when a constant "B"
battery potentlul Is. applied to the
pint' circuit of a vacuum tube, con
taining external reslstnnc. tin tn
creiise in plate rurrent canses a de
crease in the potential existing be
tween the plute and the filament.
The ' "malic" chMrscterlstlc' curve
was drawn on the assumption thut
the difference In potential between
the plute. and the filament remained
constant, obviously then, when the ex
ternal plute circuit bus other thun
sero Impedance, the static character
istic curve no longer holds true.
The characteristic curve of a tnhe
having other than r.cni Impedance In
the extermil plate circuit is the "ily
nuiuic" liiuructurlstic. The greater
the variations In plate current, the
greuter the vuriution in the voltaKe
existing between the plate nnd the
filament. If the value of It, the ex
ternal plute Impedance, is Increased,
the greater will he the variation in
the plate to filament voiluKc for the
same vuriution in plute current.
In Hit. XXVI (U) is rcpruKoiitfd the
dynamic chnrncteris.'lc of a tube with
a certain definite' .;ilue of It in the
plate circuit. C: r.e (M) rc'iriTPt'ts
tlie d.vn:it:iii- !.: ter,,tlc cT I'"
same t'.!.e with i. liirpcr value of It
in tlie piute clivi.it. Klnnlly the !
tremo condition N renehed, In whicii
R is umdc lnii. uiu ua.. i;..;
Ujmuulc churuv h. -.;
allel to the grid vo!l:;gi t.Tl a
(4)., Th!- shows that vitr'uiUMiN of
grid jtotentiul would produce no var
iation of p!:ite current. Nit wrl
iiiiiiii variiitioiiH of piaie viihiiIioiim of
plute iMitentii.l. Thew would he am
pllfled variations of grid iin'.ca'.iiii
This lust comli'lon of hnvinr the
variations of plute potential iimpl'tlei'
variations of grid potential varia
tions is the ideal condition nought lot
in vacuum tube amplifiers.
In Fig. XXVII uh tlie current til
tor of K. between the supply of alter
nuiing difference of potential at T-T,
was just K timet) what it actually Is.
All these considerations have been
based on the assumption - that the
total luipedunce (resistance to tlie
flow of an alternating current) of
the entire plate circuit existed Inter
nally In the tube between the filament
and the plate, and lhat the external
electrical circuit from the plate to
the it I u men t bud rero impedume. Of
course, this condition never exists In
practice."-- The external plate cir
cuit always has impedance In It In
the form of telephone receivers, re
sistance choke colls, or transformer
primaries, depending upon the means
thut Is employed to couple the suc
cessive tube;) together.
It Is only where the external plate
circuit of a vacuum tube has aero
Impedance that the plate voltage Is
equal to that of the B" battery. As
soon as an Impedance Is Introduced
Into the external plate circuit, part
of the total potentlul of the "B" ex
ists aa a drop across tlie external Im
pedance, so that only a portion of the
total "B" battery In available at the
Fig. XXVI represents the char
acteristic curve of tlie tube as we
have been discussing It,, with no Im
pedance in the external plate circuit.
This curve is called the "static" char
acteristic curve,. to differentiate from
the others. Suppose: that . we Intro
duce Into the external plute circuit
an lmpedunce in the form of a resist
ance as shown by R In Fig.' XXVII.
When the current flows around
the plute circuit Hows through the
resistance It there Is a drop" in po
tential across. R between the points
X und Y thut will be proportional to
the current flowing. If the value of
It and the plato potential are high
enough this potential variation be
tween X and Y will be exactly pro
portional to nnd K times thut applied
to the grid of tiie tube at T-T.
To amplify a' signal from a radio
receiver then, it In only necessary to
have a circuit whose output Is to be
amplified connected to T-T and the
amplified output taken off at X and
Y. If greuter amplification - Is de
sired the output from X and T la run
through another circuit- similar to
that shown In Fig. XXVII.
'I n n I
Curea Malaria, Chills, Fev
er Bilious Fever, Colds and
through tlie plute circuit, there will
h a voltage drop across the. resistance
It eijuul In value to R times 1, where
1 ts the nhita current in mmu ra Tf
the internal impedance of the tube be
de noted by Z, then the drop in voltage
- 'i '! i- nl.t'e to the filament inside
of the tube Is ZI. The sum of these
- .. age iirops, ZI plus RI, Is al-
I ways equal to, the applied voltage of
the "U" or plute circuit- battery. The
veltuge of the "11" battery Is constant.
I Aa the plute current Increases, the
I value of RI increases becuuse It, the
external plute resistance does not
chunge in value. Ku If the sum of ZI
ylu in m uluya equal to a constant
The Toteuiltes, a society of
radio, faua at Seattle, decided
thut receiving code signals dur
ing broadcast programs la In
evitable, and Instead of regis
tering complaints, opened a free
school to Its members for In
struction in the code.
Teopie living in isolated sec
tions are getting great satisfac
tion from radio, aa It Is a cure
for loneliness. They not only
feel that they have friends with
in "speaking distance" hut that
entertainers of the highest grade
are next door neighbors.
Major General Hqulre, chief
signal officer, U. 8. A, told the
graduates of the Camp Vail slg- '
no! school there had been great
er developments in radio In the
past decade than In auy other
science. Also that In future wars
barrages and bombardments
would be laid down by radio.
, Tlie British have developed a
two-fiurpone vacuum tube for
use in conjunction with radio.
The new tnhe. or valve, aa It Is
rolled In Knglond. Is the .Mill
iard Om.- Tlie plate voltage la
given an :iO. and the filament "
voltage, at 8.0 to 4. The base
of the tube la of the four
prong type. It, is said to com
bine efficiently the qualities of
the rectifier and amplifier, )
which make It possible to use
one tube for sll purposes.
J.F. CASEBIER & SON.
Beaver Dam, Kentucky
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II I U II 11. II M
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Ik i .'-o iL .
TKink of it, new taked
bread, calces, cookies and
pies. You can just smell
them. TKink of the times'
you robbed tbo cookie jir. " TKink vOhat it mearts to know
tKat j?ou Kave a rane tKat vliil q.vq'$cu a pcritiv? one
tKird to one-Kalf fuel sainfi.
Cole s Sanitary Dov7n Draft Range1
It is equipped with
V-4 HOT BLAST
1 Fuel Saving System
of comtustion. TKis gives you q saving of cne-tk'rd to cnf-ltnlf cn
your fuel. Burns the fuel gases that other makes cf ranges vjq'As und
carries a broad sheet of clean jlanie under all six lids and entirely nrcttnH
the oven. This means even cooking and baiting results. Even ttpndjr
heat not a flashy Wasteful one. Holds fire over night. Gns tirht
rust proof vitreous enameled linings. This range -will outlast m$ range
on te market and Jill pap for itself in fuel saved. Furnished in blue
or gray enamel or plain black. A beauty from start to f nish.
See us before our supply is exhausted.
1 ..III M I
Believ it or Not
A big games hunter had Inst re-lM
turned from tbo bills and was re
counting some of ba adventures.
"The most astonishing eznerl-
nca I had." be said, "was when I
fired my last ballot at a bear and'.
missed him." '
"Did the bear give you a chase?' I
asked one of the listeners
"No. You see he knew mo by
reputation and was so surprised at!
my missing him that ho fainted I
dead away.'.' I
By special arrangements we are now able to offer
The Daily Courier Journal
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Hurtiord Herald, SUM) the year
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This offer applies to renewals as well us new subscrip
tion. U ouly tu fople ii,iua iu jvuuiucUy, muuessce or
Indiana. New subscriptions may, if desired, bt.trt at a later
date, and renewa's will date from explrutlou of present ones.
. if you prefer an evening newspaper, you may substitute
Th ?oiilm Timm for Tl. r w l,ii-Tia
Send oi uiing yonr rtin
I Faculty Chirln B. Sryuiaur, Wll.
I Ham H. Ktld. K.br r. Vaughn, fvrrr
. H. ilill.f, 11. kl. lu vtoa, l.u P. UaU,
j I2dwar4 J. Mclfeimott, Joapii S. I.au.
i r.ul. Navllla MIIKr, O.ruai U. Vlall.r.
Jutjo li. P. -Ir.
t'aa catalacua and allHe Infanwillw
I ht.'VlLI.L' Mlful.llR, Stc, '
vc licti nut C4 Jiacidiu
UKPTcnnn iiroM n my ei cn tuc vria
linilllUlll MLimU', U!LI vi.uu I hi. .Lnii