D eaf M ade to “H ear”
Through F inger Tips
Events in the Lives of Little Men
THE FEATHERHEADS
Felix Loves the Little Dears
T h e discovery th a t th e hum an
skin's ability to detect rapid vlhra
tlons Is much g re a te r th an has pre-
vlcusly been supposed has been m ade
by Dr. Robert II. G ault, d irec to r o f
th e vibro-tactlle research laboratory
of Sm ith college.
Doctor G ault hus
been engaged for several y e ars In ex
perim ents to enable the d eaf to hear
through th e ir linger tip s by touching
C o m p e n s a te * f o r L oss o f E n a telephone receiver. Previously scl
e n lists have supposed th a t a vibra
e rg y C a u s e d b y th e D e
tion fa ster thun l.fidd tim es a second
w as too fast to be detected hy the
te c to r T u b e .
skin. According to D octor G ault, how
ever, these touch organs can detect
P roperly designed radio frequency v ibrations as fast a s 2,700 a second.
in ip litie rs contrbute not only to sen T hough m any of th e vibratio n s of the
sitivity of a receiving set bui ulso to voice a re m ore rapid th an this, “oo,”
>ts tone quality, according to resu lts for instance, as pronounced by the
obtained from a se ries of te s ts con average m ale voice being about 3,800
ducted in one of the lab o rato ries of a second, and "ah " 3.682. D octor G ault
a large radio com pany.
says th a t if th e skin can receive vi
T he function of a high frequency b ratio n s as rapid a s 2,700, It Is am ply
am plifier in the la tte r re u se may be sensitive to u n d e rstan d s|>eech. T he
difficult to com prehend a t first, since, discovery w as m ade w ith an In stru
according to theory, it is credited m ent called the “ te le ta c to r,” designed
only w ith am plification of very weak and built for his use by the Bell tele
signals to a point w here they ure of phone lab o ra to rie s in New York city
sufficient intensity to o p e rate the d e
tector tube. To u nderstand the m an
H is Position
ner in w hich an r. f. am plifier im
Gap Johnson w as trying to back
proves q uality, a study of the func aw ay from the -crossroads sto re with
tion of the detector tube will be found many yanks at th e reins and num er
useful.
ous yells and oaths. Ills d a u g h te r
In effect, a detector tube Is really a sprang from the wagon and began
“distortion" device since it is by dis beating the m ules over the head with
tortlng one-half the incom ing rudlo a club.
frequency w ave th u t the signal is
“ Why don't you buy an autum n
! m ade audible. T h e disto rtio n of tills bile?" usked a salesm an who had a r
. incoming wave is accom plished by o p rived during the operation. "It would
cratin g the d etecto r tube ut grid and save you a lot of trouble."
plate voltage values w here a slight
"I'm usen to th e — p ’tu I— trouble.'
positive cliurge will result In an ab
was the reply. "I know how to handle
norm al plute c u rre n t und a negative these devilish m ules and I w ouldn’t
charged subnorm al p late c u rre n t with know how to m anage a c a r "
respect to the effect of sim ilar churges
“ Well, it might save the young lady
on the grid if the tube w ere 0|>eruted a lot of unnecessary ex ercise '
on the “stra ig h t" p a rt o f Its grid volts
“ Aw she's going to get m arrleu
—p late cu rre n t c h a ra c te ristic curve. p r e tty soon an d needs the experience
| Thus, the incom ing w ave train , hav- In m anaging a husband.
Hud up.
, ing positive and uegative alte rn a tio n s, the re, m u les!"—K ansas City S tar.
will be re p re se n tad in the p late c ir
cuit in the form of abnorm al plute H eadach es fro m S lig h t Colds
, cu rre n t fur th e negative half and It |
L a x a tiv e BROMO QUININE] T a b le ts re-
Is this difference of p late c u rre n t val- I lle v e (h e H e a d a ch e hy c u r in g th e ('old.
I/Odk
for s ig n a tu r e o f E. W . G rove on
ue th a t causes an audible sound in j
th e box. 30c.— Adv.
the phones.
Since it la only the difference be
A P la n t Puncture» T ire»
tween the d isto rte d poeltive und neg
W ur (*< mt hi tied ngniiiKl the “p u n c
I ative hulf cycles th a t Is responsible J
(lire weed. t ’ulifi»rni>i'H rapid »prcud
for reproduction, It is evident th at
mu vine whose h alf inch thorns plin
much of the signal stre n g th Is lost in
I imvoc with m otor cur tire s on couji
(lie process— the low er h a lf of tl»e
r.v mud». A single vine found n«*»r
» u v e entirely m issing, plus th a t p a rt 1
Los Angelos covered m circle 14 feel
of the upper h a lf lost through the
hosperH te efforts to check
oppoalng effect of the d isto rted lower ! icross
(his troublesom e plant'» sp read ure
j half. For th is reason, weak signals ■
lilndered h.v Its prolific seed. ..NRI to
m ust tie am plified before detection, if
i M pm re fo o t, t . • t im iture »11 year
results of any kind a re desired.
round tiud force » continuous hit I H e.—
In the audio frequency end of the
Popular Science Monthly.
receiver it is found th a t, due to in- i
ertlu of reproducing m echunlsm s, ttie i
a ir and, lust but not least, the de- I
tecto r tube, considerable energy is re
quired to reproduce faithfully m uslcnl -
W as Y ou r
tones In the lower register.
G ra n d m o th e r’s R e m e d y
Pow erful audio am plification will
F o r every stom ach
overcom e the effect on Inertia of a ir i
und in te stin al ill.
and reproducing m echanism s, but It i
T h is good old fash*
cannot com pensate for th e loss of eu
%
loned h erb home
ergy caused hy the d etecto r tube.
■
rem edy fo r ronstl-
T he only remedy for th is Is ampUO-
ajgjfr potion, Rtomach Ills
cation before detection. T hus the ra •r*
a n d o th er derange
dio frequency am plifier com es Into Its
m ents of th e sy it
own us a c o n trib u to r to good audio
reproduction, und the m ore well de em so p revalent th ese day s 1» In even
signed stag es ahead of the detector 're n te r fav o r a» a fam ily m edicine
bun in yotir g ra n d m o th er's day.
th e b e tte r the quality ut th e output
of the set. T h ere Is one draw back,
F o rb id d e n to T rtm B e a rd
however, In m ultistage radio fre
A h is to ry o f th e ris e and fu ll o f the
quency am plification, und th is Is due
to pickup ant* in te rsta g e coupling be »card w o u ld m a ke In te re s t Ing read
ng
P erh aps th e firs t re fe re n c e to
tw een various colls in the receiver
ti< h fa c ia l n d o n im e n ts Is <o In* found
W ith several stages of tuned radio
frequency am plification, a receiver be n L e v itic u s . In w h ic h Moses g ive s ltie
«» iiiiii ; nd. “ T lio n s h a ll no t m a r the
comes so sensitive th a t colls In the
set tend to act as m in iatu re loop •«oners o f th y h e a rd ." In n e a rly a ll
• rle n in l la n d s In a n c ie n t tim e s the
aeriu ls and th u s broaden tuning und
»card was tre a s u re d un d h e ld In g re a t
destroy selectivity.
Such effects, however, a re neu tral , esfx < I
ized w ith the ure of Individual stage .
N e w T y p e of C a m e ra
shields which not only elem inute ex
tern al pickup and prevent In tersta g e , A tie s txp e o f cam era w ith (dates
| coupling, but also, by virtu e of Intro «enslfive Io lig h t rg y a In v is ib le to
duction Into the fields of th e colls, he hum an eye, can lak e pictu res
tend to stabilize still fu rth e r the re- J hrough the thickest cloud o f fog.
celver
a g ain st
oscillation.
Most
shields designed for th is purpose are j’
m ade of ulum inum and a re so planned i made H A N F O R D ’S
th a t the covers a re m ounted on the j <
subpanel or baseboard and the can |
IT M U S T B E C O O D
proper slipped into place a fte r all
Try it for Cut», Braises, Sores, etc.
w iring has been com pleted.
An R. F. Amplifier
Will Aid Quality
'jai-iiieid Tea
FINNEY OF THE FORCE
The Country Girl Can Get Along O. K.
"Zj"
SiM8 Balsam of Myrrh
L o w Im p e d a n c e T u b e *
AB 4 m le r* ara *wtk«nM<f to reto* 1 y M r a
b ri! bottle if
M tl«4.
F Ur the
H e l p A u c L o A m p lif ie r
PASTOR KOENIGS
N E R V IN E
HOME
SIZE
SAVES
L m oney
5s™«
SO LU .'JIU
GUARANTEED BY EVERY DRUGGIST
B oschee’s Syrup
h a s b een r e lie v in g c o u g h s du e to c o ld !
fo r s lx t y - o n o y e a r s .
Soothes the Throat
lo o s e n s th e p h leg m , p r o m o tes e x p e c to
r a tio n , g iv e s a g o o d n ig h t's r e st fr e e
from c o u g h in g . 30o and 90c b o ttle s.
B u y It a t y o u r d r u g sto r e. G. G. G reen,
In c., W ood b u ry, N. J.
CORNS
Ends pain at once/
In one m /nafe pain from corns Is ended.
Dr. Scholl's Zino-pads do this ta fa ty
by removing the cause— pressing and
rubbing of shoes. T h e y are thin, medi
cated, antiseptic, healing. A t all drug
and shoe stores. Coot but a tritie.
D r Scholls
'L in o -p a d s
P u f one on —the" pain h nonet
Whooping'
Cough Relieved
Thin dr**a<1 cough Is on« o f the
t daugwn.ua o f children'«
mum *«.
diRMUM
«. There I n no c u r* for
whoopmgeough. ltu n u ally runs
ila c o u r w . h u t* few drop« o f thia
w e ll kn o w n p h y s ic ia n *» p ro -
•rrip tio n w ill relieveUifl violent
roughing parox ymns,and avoid
vomiting. N o dangerous “ doa-
In g 1' nothing to upset liploatutnarha. Glaaac«
ULESSCO SSJ
CHOUP R E M E D Y
croup.
STOP CHILBLAINS
T h e crippling annoyaneea o f chilb lain«,
th a t I ndeacr lia b le h a lf numbneaa and
h a lf plain In th e fe e t canard by exposure
to snow o r cold, q u ic k ly relieved by Cat boil
W h y suffer w hen a 6 0 -c rn t box of
Carboil w ill take th e m isery out of
w alkin g ?
G et a box a t you r druggists
now. Y o u r money b ack I f not aattofled.
S P U R L O C K N E A L C Q „ NashvlUo» T an a,
0 0 Y O U S U FFE R F R O M
asth H A?
Ig ' rw-ratlnfMhavefonndrwIlef In OttowTar fUv.tfc.
lug and hraJing P» m. muranea of thruat an.I lunga
H A L L A R U C K E L N e w Y o rk
O il lU ty a lt y A c re a g e
K e v ln » o n b u rn t fle lft,
Mont
T a r m a I 10 « h m » »a. 1100 p u r r h a a e d ,
t e l & I I « in a ia li p a y a b le t-a c o m p le tio n p io .
d u r in g w e ll. A . I I . C a m p b e ll. O llm o n t. M o n t.
P A R K E R ’S
H A IR B A L S A M
« rm la & d n ir
npallairlaJUi
R eatw rea C o lo r and
B e a u ty to G r a y and F a d e d H a ir
Vn- a n d | l
<n a t
h n ig g i r t a .
H ' -M . • . I V. » ■ I . I L . N $
F I.O R F S T O N S H A M P O O l.k a l for ose in
rotine« Uon with Lark« r'a H air Ito aam Makes th»
hair soft and fluffy l$n cents by ma l or at drug,
trials 11 tocoX Chemical W orks, P n U h o fM , N. X.
4 r <ip 9 I n «
d r u « • la
tram Alkail
or s t h i r
Irrttollo”.
Th« aid ahnpl« r*tna»ir
Uiat bring* c-aoitwtlnT
é te g d U tt
HaJIABerfca« Saw V a r ia ti
M it c h e ll i»" :
E ye
r n-t
S a l v e la bast. St«, ad
For S O R E E V E S
An audio amplifier is g reatly im
proved if the tubes used | m ihk csh low
o u tp u t im pedance values. T ills Is p a r
ticu larly (rue If the am plifier coupling
unit a re tran sfo rm e rs designed sev- I
Traw iM far M JS IN U S . TRADES er FR0FESSI0N3
L it r o ll a n y tim e . S end fo r l i t e r a t u r e .
e ral y e ars ago. T h is should be of
O R E O O N IN S T IT U T E O F T E C H N O L O G Y
special Interest to -ecelver ow ners
E . M . 0 * A . IIK Ig .
P o rt la u d , Orej^oo
who p urchased th eir equipm ent two or
th ree y e ars ago. T he Im provem ent In
quality am plification w ith old lype I
Heeulta wondwrfnl and attr»-. O n tto b m p -i* b> <
PR|T e $150 AT y0UR DRUG STORE I
o f Krw m ola aktn bleach w ill co ivtn r« the w d
tra n sfo rm e rs w as conclusively deni- i
ah ep llc al A lso enrew ♦•«•*», a. Prien | ] ft. A *«
adik fa r Sample
»«r d e a le r ItoaiH y florifelct Free I n C, II.
o n stra te d In a series of ex p erim en ts |
£ •rry
tk».. Dept. M. fctfl M ichigan A » e .tk i« w g o
"KOENIG MEDICINE CO.
conducted at the Zetka lab o rato ries [
1045 N WELLS ST. CHICAGO ILL. |
W N U , P O R T L A N D , NO 51 1927.
w ith some of th e ir low ou tp u t Imped- 1
a nee tubes.
A th o u g h t it*»*« m » n k ite » m lot o f
Good quality radio am plification 1 T alk may be a g<»»<l preventive.
tim e w h e n he litirr h » .
cannot be obtained unless (lie low I
notes a re sa tisfac to rily am plified, and |
If low output Im pedance tubes are
used b e tte r energy tra n s fe r on low j
n o tes will tie obtained. As a m utter )
of fact, b e tte r energy tra n s fe r will lie
btalned on all frequencies. Usually
For gmeratlnns Cuticura Soap .n d O in t
ment have afforded the purest, sweetest snd
a tube w ith a low o utput Im pedance
most
satisfactory method of p io n v r, g snd
has a low am plification constant, but
m aintaining a healthy condition of skin
the overall am plification of the tufie-
and acalp. Tender-faced men find the
coupling unit Is ery seldom lowered.
frreiy-iathertng Cuticura Shaving Stick a
Iiei-ause w ith the low er o utput Imped
necessity. Cuticura Talcum is an ideal
slice and a constant load Im pedance a
powder, cooling end refreshing.
g re a te r portion of the voltage a ia ll
Ota
at « and «to Talrwwe
able In th e tube la delivered to the
load. Use low Im pedanre tubes tri all
C e O e w r a S h a r i n g S to c k 2 5 c .
sockets In the audio am plifier.
S C H O O L F O R M EN
Epilepsy
Nervousness fr
Sleeplessness '
Cuticura Preparations
for All the Family
FK