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February 09, 1962 - Image 5

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Text
Publication:
The Michigan Daily, 1962-02-09

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FEBRUARY 9,1962

THE MICHIGAN DAILY

A

FEBRUARY 9,1962 THE MICHIGAN DAILY

VA
i

MICROWAVE TUBE:
Researchers Devise New Helix

Two University researchers have
devised a theory and method to
increase ,by 40 to 100 per cent the
efficiency of microwave trans-
mitting tubes.
Used in radar and satellite com-
munications, these tubes are
known as traveling-wave ampli-
fiers. Studies by Prof. Joseph E.
Rowe and John Meeker of the
electron physics laboratory have
resulted in improvement of the
method by which the signal
travels through the tube.
In this device the signal wave
is carried along a helix, a spiral
of wire which looks like the coil
spring of old fashioned screen
doors.
Inside the central axis of the
helix, a beam of electron streams,
interacting electro - magnetically'
with the signal moving along the
helix increase the energy of the
signal and thus amplify it.
Velocity Constant
The velocity of the signal on
the helix is constant. However,
the electrons inside the helix tend
to slow it down toward the end of
the beam. As they slow down, the
electrons drop out of phase with
the signal. The more the two move
out of phase, the less, increase in
energy the signal receives.
For some time, electrical en-
gineers have realized that the
energy and therefore the effi-
ciency of the tube could be im-
proved by slowing down the signal
wave of the helix, Prof. Rowe ex-
plains.
He' and Meeker accomplished
this decrease in velocity by creat-
ing a theory for varying the pitch
-the number of turns of coils
per inch of the end of the helix.
Increase Pitch
By increasing the number of
turns, the signal is slowed. It
therefore remains more in phase
with the electron beam, yielding
a 40 to 100 per cent improvement
in efficiency, Prof. 'Rowe claims.
On the model being investigated,
the pitch is varied from 18 and
one half turns per inch to 37
turns per inch in the lower end of
the helix. This increase in the
last one and one quarter of the
eight-inch helix keeps it more
in phase.
Tlis improvement means that

Psycho logy
Unit Alters
Class Form
By ELLEN SILVERMAN
In order to accommodate more
students, the psychology depart-
ment has changed the format of
certain recitation sections of Psy-
chology 101, Richard Wagner of
the psychology department said
Wednesday.
Under this new plan, a few
sections were combined into one
lecture section. This will allow 250
students to register for a Monday
afternoon lecture which will sup-
plement the Thursday morning
lecture required for all students.
Wagner explained that this new
lecture section will replace the
recitation section required of oth-
er students. In it, four or five lec-
turers will speak for approxi-
mately one month periods.
Have 'Free Rein'
"This is not as if there were
now two courses," Wagner said.
The teaching fellows have free
rein within the recitation sections
and this is just one way to ap-
proach teaching, he explained.
"It is possible for some of the
teaching fellows to lecture in their
own recitation sections, too," he
noted.
Through the initiation of this
lecture group, the department
hopes that there will be room for
875 students in the course. Al-
though it is a traditionally pop-
ular course, registration on the
first day was "surprisingly slow,"
Wagner commented.
Drop Sections
Another change made by the
department was the dropping of
three recitation sections. Wagner
explained that this allowed each
teaching fellow to cut down the
number of sections he was to teach
from three to two.
To allow the same number of
students to register, however, the
enrollment limit was raised in the
other sections from 20 to 25.
This change folows the division
of the introductory psychology
courses into two parts last fall.
Psychology 100 deals with the sub-
ject as a biological science and
Psychology 101 considers it as a
social science.

For Direct Classified Ad Service, Phone NO 2-4786
from 1:00 to 3:00 P.M. Monday through Friday, and Saturday 9:30 'tilI 11:30 AA.M.

-om

MICHIGAN DAILY
CLASSIFIED ADVERTISING RATES

U

7 7,7

HI-HO, HI-HO,
It's off to Schwaben Inn we go,
No more quaddy burgers for me,
HI-HO, HI-HO.
215 S. Ashley, Ann Arbor
J17
HI-FI, PHONO TV, and radio repair.
Clip this ad for free pick~up and de-
livery. Campus Radio and TV, 325 E.
Hoover. NO 5-6644. J24
A-1 New and Used Instruments
BANJOS. GUITARS AND BONGOS
Rental Purchase Plan
PAUL'S MUSICAL REPAIR
119 W. Washington NO 2-1834
BEFORE you buy a class ring, took at
the official Michigan ring. Burr-Pat-
terson and Auld Co. 1209 South Uni-
versity, NO 8-8887. Jil
Finding holes in your winter cloth-
ing? Find that the wind whistles
through and sends chills up and
down your spine? Then sendthem
to
WEAVE-BAC SHOP
224 Arcade E- HNO 2-4647
"We'll reweave them to look like new"
J12A
COME IN AND BROWSE AT THE'
TREASU RE
MART

LINES
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12 CUSHMAN EAGLE Motor Scc
with 7.9 engines, Call HA 6-823f

Figure 5 average words to a line.
Phone NO 2-4786

THE NEW YORK TIMES delivered daily.
Student Newspaper Agency, PO Box
241, Ann Arbor, Michigan. M10
MAGAZINES: For special student
rates, call NO 2-3061 days or eve-
nings. Student Periodical Agency,
Box 1161, Ann Arbor. B1
LADY'S Raccoon Coat-size 12, good
condition. $39. Call 3-0680. B40
DIAMONDS-Charles Reaver Co. is of-
fering for sale estate -and imported
diamonds. For appointment call NO
2-5685 after 6 P.M. M2

BARGAINS IN
ALL DEPARTMENTS
DURING THE
MONTH OF
FEBRUARY
at
GRIN NELL'S
NO 2-5667

IMPROVED HELIX-Prof. Joseph Rowe of the electron physics
laboratory demonstrates an inproved microwave transmitting
tube. To increase the efficiency of the travelling wave amplifier,
as this tube is called, he has increased the number of turns or
coils in the last portion of the helix. This reduces the difference
between the electron beam and the resistance in the helix keeping
the two more closely in phase with each other, thereby increas-
ing the tube's efficiency. This project was sponsored by the Rome
Air Development Center of the Air Force.

529 Detroit St.

NO 2-1363

for a given signal gain and power
output, the tapered pitch tube
would be shorter, lighter and re-
quire less power than its untapered
counterpart. These are significant
for use in satellites where any
weight reduction is beneficial,
Prof. Rowe said.
Reduce Length I
The length of these tubes, the
cost of which can run from hun-
dreds to thousands of dollars each,
could be reduced by 20 to 30 per
cent, depending on the particular
tube, he said. Usually, the tubes
are about a foot long.

For example, in a 3 billion cycle
tube with a power input of 200
watts, the best efficiency has been
35 per cent at 2.6 billion cycles.
The new helix will increase the
cycles to 3.8 billion cycles as a
result of the new coils.
The research was sponsored by
the Rome Air Development Cen-
ter of the United States Air Force.
A paper, outlining the research
has been prepared for publication
in a technical journal of electrical
engineers.

Featuring student ufrnishings of
all kinds, appliances, typewriters,
televisions, bicycles, etc. Open
Monday & Friday evenings 'til 9.
J12
mM
RADIO ADV. SALESMAN opportunity
avail. Professional salesmanship &
hard work. Can bring both financial
reward & community prestige. Write
WOIA-.''M and AM. Box 5, Ann Ar-
bor, or. callaMr. Tester at NO 3-0569.
H2
BAR HARBOR, MAINE - A General
Medical Technologist is needed by
April 1 by the Mount Desert Island
Hospital, locatedin charming Bar
Harbor on the Maine seacoast. Sal-
ary is commensurate with training
and experience. Please contact Rufus
W. Manderson, Administrator, Mount
Desert Island Hospital, Bar Harbor,
Maine. Hi

MALE GRAD STUDENTS
Two extra large double rooms for
rent, one with private half bath.
923 Olivia, NO 2-1465. C10
FOUR ROOMS and bath, first floor, 2097
South State. $100, includes stove, re-
frigerator, garage, electricity, and
water. Newly decorated. Call at 2077
S. State or phone NO 2-0523, evenings
NO 2-6244. Cli
LARGE dental suite. Clinic in East De-
troit-Warren area with physician with
practice in immediate area. Dr. Fogel,
PR 1-7790. C9
BEAUTIFUL Huron Towers, spacious
one-bedroom, 911B, to sub-lease. $125
a month. See manager, NO 3-0800. C8
NEAR STATE AND PACKARD
' Five-room unfurnished, first floor
apartment. Stove, refrigerator, heat,
and water furnished. Off-street
parking. Phone NO 2-6064. C7
NEED ONE GUY for double apartment
-$37.50 per month. Two blocks from
campus. NO 3-7759. C6
CAMPUS AREA
Apartment for three. Newly decor-
ated and furnished. All utilities in-
cluded. Laundry facilities. NO 5-
9449. C5
FOR RENT: Large attractive furnished
apartment for two, three, or four men
or women. Includes living room, bed-
room, - kitchen, study den, one-car
garage, TV set. $ 20/month. 910 West
Washington. Call NO 5-7416. C4
UNFURNISHED APT. - Just vacated
after 2 yrs. Living rrn., kitchen with
stove and refrig., bdrm., walk-in clos-
et, bathrm., laundry rm., in 4-unit
apt. bldg. Warm and pleasant. 917
S. Main. Call NO 5-5851. C3
PARKING SPACE for rent-Very close
to Frieze Bldg. NO 2-7274. C6
TWO-CAR shelters available at 1022
Forest. Call NO 2-5035 after 6 p.m. C22
LOT PARKING available. Call NO 2
1443. C31
PARKING SPACE close to East Quad,
$5.50 per month. Call NO 3-4322. C8
ROOM FOR RENT for steady male grad-
uate. Business or Professional prefer-
ence. Modern, clean, quiet home.
Telephone: NO 2-4738. C12
ROOMS-Single or double with kitchen.
305 E. Liberty. Inquire at 301 E.
Liberty, beginning Jan. 22 or call
HU 3-3798 before 9 a.m. or after 7:30
p.m. 021
GIRL'S large single room in home with
other girls by campus and hospital.
Kitchen, TV, auto, laundry. Very
comfortable. NO 3-9232 late afternoon
and evening. C3I

Restyled Uprights

Other Uprights

from $69.501

Hammond Organ was $1455
NOW $1195
Other Hammonds from $595
Used Baldwin Grand Piano
only $395
Used Weber Grand Piano
at $495
xa

THE NEW YORK TIMES delivered daf
Student Newspaper Agency, PO B
241, Ann Arbor, Michigan. F
GROESBECK: What in the world we
those yellow IBM cards good for? D
someone complain about getting t
twentieth copy from the white re
istrationaires which arebexactly It
the yellow ones. How about an ai
plane ticket next semester? I
CABERIAE KENYON BOYS, Who 14
their pants at Ma's? We've got the
The "I-Crave-Its,"F
JUDY, so sorry that the answers y
copied on our final were all wron
See you Monday when we take
over again. Love, John. F
DUE TO popular demandDr. Cans
will give the second in his series
sex lectures "What EveryStude
Should Know" this Sunday at 3:00
Auditorium E. F
SUE, I love you dearly, but why do
have to take all of the mats back I
day? You could take a walk nc
and then. Errant Boy F
DO YOU often ponder over the perso
al advertisements? Here are son
hints so that you will assume tl
proper fraue of reference when
ciphering these intimate messag
1) Do not use logic or any other r
tional powers you might possess,
Let your imagination run rarnpar
3) Associate yourself with the po
sible suggestive meanings, and 4) A
sume peple writing them are insa
or a little neurotic. Usins. F
WATCH AND WAIT. Soon a math i
structor will be non-linearally trar
formed. F
YEARS AGO the boy who kissed a g
was a cad; now he's just keeping t
his end of the conversation. R
SBX has FREE plasticized book cove
FOR YOU. Save $ at SBX. F
BUY AND SELL used texts at SB
Save 10-20 per cent. Basement SA
F
PLANNED PARENTHOOD' CLINIC. A
vice of physician on birth contrn
Professional counselsonumarria
problems. Clinic hours Tues., ar.
Thurs. 7:30-9. 201 E. Liberty. Ca
NO 2-9281. F
WE PUBLISH humorous greeting car
designed exclusively fat college st
dents. We are looking for good ide
or sketches. Top prices paid. Wri
College Hall Cards, Larchmont, Ne
York. F
DISPOSING of my large library at pr
vate sale. Rare opportunity for sti
dents to build up a library of gon
books at low prices. Special low pric
on sets of books. Showings at 6
Packard St (near State) from
P.M. to 4 P.M. every day except Sur
day. F

$1891

Why buy from out of
town -- see this
GARRARD
"A" Changer
Shure M7D Cartridge
not $103.50
BUT 79.50

MICH IGANENSIAN
yobr yearbook
is, now selling for
$6.50

ARE YOU
THE MADISON
TYPE?

You Save 22%
at
Hi Fi& TV
Center,
304 S. THAYER
ACROSS FROM HILL AUDITORIUM
Service and repairs by
Fred Flack, M.A.E.S.
4~X19
DON'T YOU HAVE a heart? Even
rough, tough bikes from Beaver's
need to be protected from Ann Ar-.
bor rain and snow. Ghet a cover for
your Bike today at
BEAVER BIKE
AND HARDWARE
Z13

THIS IS NO JOKE 1
DIAMONI)S WHOLESALE
Diamond speeialists for 17 years
Before you buy, consult us.
ROBERT HAACK, Diamond Import
Suite 504, First Nat'l Bldg.
NO 3-0653
Miners-Cutters--Settrs
Ann Arbor, Milwaukee, Madison,
Minneapolis, and Caracas, Venezue
ATTENTION ROTC
OFFICERS' SHOES
Army-Navy Oxfords- $7.95
Socks 39c Shorts 69c
Military Supplies
SAM'S STORE
122 E. WASHINGTON V

AVE.

You.

st

THIN

You're NOT unt'
-itf

you'wehap7y
ii you JOIN
pit1

2 bedroom apartments 500 yds. from
Union. New, furnished, carpeted,
luxurious. Air conditioned, full kit-
chen, parking. Call NO 3-6357, 320
E. Madison.
Open Sat. and Sun: Afternoons
HURON
TOWERS
APARTMENTS
A distinguished address with
every mcdern apartment con-
venience provided: Our own
bus service, large private bal-
conies for outdoor living, the
sophistication of a swimming
pool and sundecks, complete
building maintenance service,
trust-worthy domestics and un-
derground parking at your op-
tion, individual room heat and
airconditioning controls, color
co-ordinated kitchens and baths.
Studios with dressing room,
one-, two- and three-bedroom
apartments available on most
floors with heat, water, range,
refrigerator included in rental.
We invite your inspection of our
model apartments on the prem-
ises.
NINE- OR TWELVE-MONTH LEASE
WITH PERMISSION TO SUBLET
UNFURNISHED, $98 to $330
FURNISHED, FROM $118
2200 Fuller Road Near North Campus
and Veterans Hospital
Phone NOrmandy 3-0800, 5-9161

FRIENDLY SERVICE
IS OUR BUSINESS

Stop in NOW for
broke work
engine tune-up
battery and tire check-
"You expect more from
Standard & you get it."

C-TED
STANDARD
SERVICE

SOUTH UNIVERSITY &
NO 8-9168

'54 STUDEBAKER Champion. Radio,
heater, overdrive, and rebuilt engine.
Used as professor's commuter Clean
and dependable. $330. Call 663-7240.
N40

USieStaff or Sports Staff
on

FOREIGN CAR SERVICE
we service all makes and models
of Foreign and Sports Cars.

MADISON AVENUE APTS.

Lubrication $1.50

IA

T .r.. ..r . C.. .. ...a. r i6

Nve Motor Sn 1 Ps

I

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