Evening star., 1924-10-28
ENGINEER DEv|SES
NEW RADIO CIRCUIT
Presley Invention Consid-
cred One of Most Notable
in History of Wireless.
BY CARL II. BUTMAN.

Jackson H. PRESLEY. chief engineer
OF the Signal Corps radio laboratories.
has invented a radically new circuit
for the superheterodyne, which is.
according to prominent radio epgi-
neers, "the most remarkable super
heterodyne that has ever been de-
veloped." The essential features of
the new circuit are its remarkable
economy and simplicity Of operation
and the radical though simple fea-
lures embodied in the tuning circuit.
The new circuit utilizcs the familiar
principle of capacity bridge in such
manner as to provide a positive
non-radiating circuit, which employs
an oscfllating detector. The same
tube which acts as the detector pro-
vides the beat frequency oscillations,
thus eliminating the use Of one tube
and without the complications of the
second harmonic principle. This ar
rangement permits the use of a very
small loop antenna, requires but two
tuning dials and Is SO compact that
the entire circuit may be set up in
standard cabinet of by by IS
inches. Without tubes and batteries
IL is understood the set may be built
for less than SIS.
Discovery Made Public,
Asked if he proposed to dedicate
mis- invention to the public in the
dedicated his famous wired wireless
patents of several years ago, Mr..
PRESLEY said: II would like to have
every one Of the 20, 600, 900 radio
enthusiasts in this country who may
be Interested in this new super
heterodyne tuning circuit build and
operate 1t. 1 have authorized the
publication in Popular Radio Of the
complete details Of the circuit as ap-
piled to superheterodyne reception.
I have recommended a list Of many
radio parts from manufacturers
whose products seem to be the best
adapted for this circuit and whose
parts are generally available to the
public at low cost 1t will thus be
possible for any one having a slight
mechanical knowledge to construct
an experimental set. I have applied
for patent which will assure to the
Government of the United States the
full righst for its use. and have
reserved for myself only the privilege
of collecting royalties from the spe-
cific commercial use of my rights. If
/ sell my rights 1t will be with the
understanding that those who love
radio for it's facinating experimental
interest will not be deprived of the
use Of my invention"
Inventor at 20.
Mr.. Presley is the youngest and
one of the ghest-salaried radio engi-
neers in the United States Govern
ment service. He is but 26 years of
age and upon his young shoulders
rests the heavy responsibility OF the
technical development and design of
all of the Army's airplane and field
radio apparatus. In addition to his
technical accomplishments he has an
enviable military record. He was a
member of the University of Cali
fornia's ambulance contingent which
joined the French in the early stages
of the war. Upon Americas entry
young PRESLEY transferred to the Sig
nal Corps, where he was on duty in
Paris at the Signal Corps research
and inspection division. There he as
sociated with T.. II Armstrong, Will
liam II. Priess, Harry Houck, Profit. f.
0. Hubert, A. d. Silva and several
other radio engineers who have writ
ten brilliant pages in Americas short