Evening star., 1923-07-01

A year ago the idea of ,ak1ng a
radio receiving set on ones vacation
was usually regarded as very lmprac-
tical and somewhat inconvenient. The
ordinary crystal receiving set was not
satisfactory, and the tube set was
bulky and inconvenient. Now, how
ever, the developments of the past
year not only make 1t possible but
advisable to carry a radio set to camp
or summer resort.
AS result of the application of
the single dry cell battery such as
the WD II it is now possible to use
vacuum tube set in places remote
from storage-battery charging faciii-
ties such as the isolated farm the
seashore and the summer camp. a..
There Is no limit to the lengths we
may now go. The disciple OF izaak
Walton can take his outfit with him
to some, shady nook, and II the 1sh
are not biting we'll. he can while away
the hours listening to the soothing
strains of music a la radio from
broadcaster miles distant. or he can
take in a lecture on how 70 nsn, or
hear q discussion on the fall styles
in evening wear not TO mene'1n ,nans 1se
mitter, installed at the camp Will
insure that he does not miss the
dinner bell.
4 The canoe. the motor boat, the
automobile and even the motor cycle
summer be equipped with a radio
receiver, and no matter where you
go YOU will be within easy range OF
one or more broadcasters.
No argument is necessary to con-
radio matters. that the messy six
volt storage battery is poorly adapted
to portable radio sets on account OF
weight, bulk and the necessity OF
having to provide charging means.
The actual weight reduction Is ap-
proximately forty pounds lesser
Weights are often the determining
factor In the selection. of camp equip
ment.
usual to cities and congested centers
spaces. and with the exception Of
intense summer static conditions
splendid results may be expected, due
to the high sensitivity Of the vacuum
tube receiver. Through processes re-
Gently developed the Westinghouse
been perfected to the point where. II
not mistreated. it's life Is in the
neighborhood Of 1000 hours.
The characteristics of WD IL and
TwD 12 are Identical. the only differ
ence being wD II is equipped with
special base. which requires an
adapter for use in standard sockets.
wD IL is equipped with standard
base.
In constructing these tubes the
tungsten flament is replaced by a
platinum filament coated with salts
that will allow greater electron
omission with less battery capacity
this development has made possible
a tube having all the desirable quail
tiles of an untreated tungsten fla
ment tube, which. can be operated
from a common dry battery. The
WD tubes are exhausted to an ex-
tremefy high vacuum. and they do
not depend on inclosed gas for their
detecting properties. They are thus
not critical in any adjustment either
to flament, current. plate voltage or
to the constants OF the circuit In
which they. are used.
Another advantage is that the dry
cells necessary to operate the TUBE
can be purchased for about 40 cents,
and they are rarely difficult to pro-
cure, even in the smallest of villages
or country stores. Therefore, II your
power runs out It Is very easy, cheap
and convenient to replenish.
The farmer now can enjoy with
his suburban and city brother the
daily weather, time and market re-
ports, as well as the many entertain
ing, and instructing features provid-
ed by more than 800 broadcasting sta
The research laboratories devoted
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