Evening public ledger. [volume] (Philadelphia [Pa.]) 1914-1942, 1921-05-07

laid thereon pair Of bright yellow,
semitransparent gloves.
The disapproval with which McCarty
eyed them changed quickly to curiosity.
rs Il airs you're putting on, Denny.
with your gloves? They look like rub
Der to me! II that's the latest style,
you male fashion manikin----"
on h1sss5 nSt they pSs psans DIS R,1sis %i
Ing ridiculc. HHnd Il twill interest
you to know Il, I've rubber. soled boots
on and rubberized clothes under these
I've no mind to let myself in for any
shocks from Terhune's machines -
And I suppose along with st. Jo-
seph in your pocket you've got a hpre's
foot and one Of those little worsted
Rintintins like Molly's husband brought
back from France!" McCnrty's tone
sounded the depths Of scorn. There's
an old ladies' home I've been contrib.
uting to for years in memory Of my
mother, with never a soul OF my own
ing twill be just the place for you,
"Old woman or no." Dennis retortcl
dogscdly. "I'm taking no chances with
Terhune and his devilments!"
! McCarty shrugged.
ITS little worry you need to have
I, about Mr.. Terhune; tits only the brain
he tries his little experiments on, so
you're perfectly safe ~
Dennis smiled and pocketed the Of
Tending gloves, but made no reply and
in silence they started for the apart
ments of the criminologist.
An angular young man with the face
of n student opened the door to them
and spilled pleasantly.
Mr.. Terhunc told me that he was
expecting you and your friend. Mr.. Nc
Carly. He Is just completing the ar
rangcment Of his apparatus and he said
that you were both to go to the consult
ing room"
They found Terhune emerging from
the familiar screen In one corner OF
the great bare room which now was
furnished merely with a row Of chairs
facing what appeared to be a motion
picture screen, and single chair set
forward and we'll at one side, like that
of q teacher before a class.
II thought you might come little
earlier. my dear McCarty, but there
will still be time for. me to explain our
experiment this evening to you" Ter
hume shook hands in high good humor.
II see by the papers that you and
Inspector Druet have followed the OBJ
vious course; ! warned you against II,
but l should have known how futile my
effort would be. Take my word for IL.
McCarty, You will have to let the valet
Hill 60 within twenty four hours"
'I'd not be surprised sir" Nc
Carly responded quietly, but there was
Il sudden twinkle in his eye.
Dennis tugged surreptitiously, at his
sleeve.
What is it, moving pictures?" he
asked In rasping whisper.
Yes. Of sort, Riordan.' Ter
hume himself answered with smile
You. will merely see series of NUN
bera protected on the screen, but J
will explain them to you later. | am
using the old association test. McCarty,
but IN connection with new and i'm
proved tonoscope called the vibra-
toscope. Do you sec this drum?'
He moved the screen aside as he
spoke and displayed large cylindrical
case mounted upon a platform with
supports at either end and a scale like
n double foot rule projected across but
not touching its rounded side. which
almost infnitesimal holes. Before It
an upright brass arm held needle
POINTER tipped with a tiny Pickering
flame.
Look at that. now - exclaimed
tDennis, impressed. "And this vibrat
what you said, sir-what does II
do?'
1T projects the vibration of the hu-
man voice upon the screen out there,
much in the manner of the motion pic
ture machine responded Terhune.
The original tonoscope merely regis
tered the tonal quality. showing by q
! lta la Il; al ,hak a Il.
Of fiat, but with. this amplifed vibra-
trOscope the vocal manifestations OF
emotion may be measured down to an
accuracy OF a hundrcdth Of tone or
, even finer.
, The vibrations Of the voice. as you
, see now while ] am speaking, cause
that little fame on the needle to flicker,
diminishing with the lowered degrees
of q single tone and rising with its
upward trend. Inside that cylindrical
case Is large drum which contains
some 10000 holes arranged in rows no
as to represent n series of tone shnd
ings covering the entire range Of the
human voice from murmur to a shrek
In u tonoscope there are only $4,000
holes, which form merely an octave DC
q you follow me?"
, McCarty was studying the apparatus
, closely, but Dennis nodded
: 'Ycs, sir he said somewhat un.
,, certainly. "Im quite a ways behind
, but misdoubt III catch up when / sec
z it actually working on the screen. And
! We don't have TO hold any little bulbs
nor wires nor anything?"
4 NO, merely to listen and watch.
I shall no ask you nor McCarty to take
g any moro active part in tOnight's test. .
. But just how does this work, Mr.
y Terhunc" McCarty asked.
I by the revolution OF the inner druT
you sce," explained the criminologist
. II set it in motion when thr'test starts
Z lf the speaker sounds middle C--whicl
o in the original t0noscope makes 2J6 vi.
. brRtiOns a ScCond--the line on the drum
which has go holes. will seem 10 re
mRin stationary while all tho otheu
rows are continuing to move the lin,
which stands still points to that nam.
her on the horizontal scale and Is ther
a Projected on the screen. Tho number.
I on the vibratoScope. however, are DIFF
~ tcrcntly graded. In action the process,
Ii nlmost instantaneous, so that sount
Is seen at practically the same time thai
. it is heard. All, good evening, Mr.
O'ROurke !"
, He stepped from behind the screen
. and drew it's panel hastily across after
him so that the earlier arrivals wcr,
, for the time being hidden from the new
: conner. and Dennis whispered conf
: demially:
. Honest to God. Mac, did you nm
p ucrstand ON" single word OF all that
n discourse? | did not, but small matter
. OF that so long as it's not my voice tha
contraption iy taking account Of!