PHY-SICSJJE[PARTMENT
PROQUBESRAY TUBEE
'Vew Vwinnuu k ue I)ei eloped Byt=
CeneraI ElctrieC (omniy, Pur-
chase~d For Research '4Sork
IS PLACEDON DISPLAY '
One of the new Coolidge cathode ray2 ir rn
tubes which has been recently de- ,. Super1 Jirl
veloped in the research laboratories ofh GeraElcic om nyad
which has gained much notice of late,
has been procured by the University =' yuality,
for an investigation now being carried J y1"
on by the department of engineering - (
research for the physics department,yC+
and will be, placed on exhibition for a --~1
short time before it is installed, ac-'c=
cordling to Prof. Ora S. Duff~ndack, of,..
the physics department. The tube - + .
was purchased from the Detroit Edi-
sncompany. ia oir
Owing to tli fact that 'it will be im- '2:
possible to get a ,good view of the tube'
,after it is permanently mounted, the 4k
case in the m In corridor of the new:°
physics laboratory for a short period./
After the exhibition, the tube will be r°-
mounted in a specially constructed 1 E
lead cabinet and will be excited at=m.:_
200,000 volts by the high tension X- I
ray apparatus of the department.
"The value of the Coolidge tube,"!S lj
explained Professor Duffendack, " lies =
in its ,ability to send out a large quan- - Ir
tity of cathode,rays into the air. These jLJ ,1=
rays are streams of electrons project-2
ed at high speeds through a thin'
nickel window at one end of the tul.b2!
and which correspond to the beta rays
which are sent out from radium .and,
other Y'adioactive materials. The
quantity of electrons which is sent out 1
of this tube per minute is more thani. "SPRING Suits at $35 and up'. are nothing
that which is emitted by a ton of rag- to get- out an "extra" edition of the paper.
dium in the same time. Their speed!.°
and penetrating power is controlled ( about-or cause an earthquake-but we insist
,by regulating the voltage at which the 12 and we can prove that into our clothes of2
tube is excit(A. This type of tube has ! riea ooesfie
been operated at 350,000 volts and Dr. - theseprcs we put superior'woesfir
Coolidge expects to exceed this voltage 2 tailoring 'and better designing than these prices=
greatly in the future."= usually command tdy
The manufacture of the tube itself -ay I
was a distinctive achievement, accord--
ing to Professor Duffendack. It was =-
made possible by the development of -
the method for making a large seal of -
metal to glass by the perfection of a4 thnAmeal fil AndoTmou1in1 Th
window must be thin to permit the ~
passage of a large number of ee-CUTM AIO
trons, but it must not have even the -
smallest hole in it for the tube can be
operated only under a very high vac- I 61 East LbrySt.
uum.
Ii 11

THE MICHIGAN DAILY
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OUR TRUST DEPARTMENT
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OLDEST NATIONAL BANK IN MICHIGAN.

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WOOLFOLK'S

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letters of
recomrmendation

SCHlEDlULEi
matinaees
Picture W :0 ?
Van udeville 3:15i
Picture 4:15
-NighIts
Va ude ville 6:41
Lecture 10:50

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"THE SURPRISE COMED!ANS"
WITH
EIGHT ENGLISH MAS2", tS
IN

s :e; t
4 r 7
Tr. _.
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;, a

"DANCE

SURPRI '

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"SRPRISES FROM THE WES .T"
I "THE SURPRISE SISTERS"

Jatince !"I'
NIghts
Adults 50c
Children .25t

EXPERIE~NCED pipe-smokers from Cape Lis-
burne to Cape Sable (get out your map of North
America!) recommend P. A. to you as the
finest tobacco that ever lined the bowl of a pipe.
You'll check-in with their recommendation.
Why, the instant you swing bac~ the hinged
lid on the tidy red tin, your olfactory nerve reg-
isters a fragrance like that of a pine-grove on a
damp morning. And when you tuck a load of
this wonderful tobacco into your pipe -- say,
Mister!
Cool as Cape Lisburne," mentioned above.
Sweet as the plaudits of a first-night audience.
Mild as morning in Cape Sable. (That's work-
ing-in the old geography!) Mild, yet with a
full tobacco body that completely satisfies your
smoke-taste. Buy some Prinzce Albert today and
"make the test!
-I CbE ALBER

E
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1

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"THE SURPRISE ACCORDIONIST"

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P
AR""THUR r
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"THE BOY SURPRISE TENOR" C f } "V
wlm-HE"R SA L 41 1'f Y
Y t y R9 i
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W A--4,L H
SHE SURPRISES THE
17
"-I'¢Sy ", rry Ycu969 : "_.. .,1ECN 5C i:wk:
F
C
R 3 FINA" !
BY ENTIRE COMPANY


P. A. is sold everywhere in
tidy red tins, pound and half-
pound tin humidors, and
pound crystal-glass hum idors
wiith sponge-moistener top.
XAnd always with every bit
of bite and parch removed by
the Prince Albert process.

I!

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9

-The Surprise Photoplay-
L h ~ ~- RI C " --

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