Evening star. [volume] (Washington, D.C.) 1854-1972, 1919-08-24

Y STAR, WASHINGTO
ago . news item. appeared In this pa
per stating the shortage Of radio op-
orators and The merchant marine CALI
ing for moro operators with An In
crease in salary Another branch Of
fering 9oeA opportunities to thu radio
operator iS the air mail service. which
promises to become 4 permanent in
stitution and will have q rapid
growth.
Stations 1eoDsning Hsre-
The number Of schools and UNIVERSE
ties teaching this subject has in
creased materially. In this city the
Central High School. Georgetown Uni
versity and Mckinley High School
have had stations in operation. and It
IL learned that these schools will re-
open when permitted to do 50 by the
government. The Y. N. c. A. has es-
tablished classes for its members.
The National Radio School, which has
been here about i've years, now under
the management Of Mr.. Haas, a radio
electrician expert. Also the Service
Radio School, whcih celebrated its
drst anniversary q few weeks ago.
It has q STAFF Of government oper-
atorS.
Radio Is Booming!
Therefore, who can predict what
conditions will confront the amateur
when transmitting IL resumed? QRM,
and plenty of it. ON. seems certain.
How will we remedy It? Will It be
through new, undamped and power
bulb transmission by amateurs, or
some new swstem Of interference pre-
vention. or will it be through traffie
regulations? A solution of this prob
lem would be welcomed by all Of ".
And maybe the Navy Department.
An expression of your views will be
highly appreciated.
Suggestions Solicited.
Now let US get busy and try to work
this thing out together. See If you
can think OF q way to help relieve
this situation and be prepared to cope
with 1t when the time arrives. That
time cannot be far of. and we should
not wait. but try to devise some sys-
tenn in advance to provide for 1t so
that when the time does come we can
get the official "K' ga" we will be
ready and able to handle the traffic
smoothly without having the ether
constantly damned.
Your suggestions will be published
in these columns 50 that you may
have the benefit Of each others ideas
in working out this problem.
In the first of these articles. publish
ed July q, there was described an o.
cillating audion constructed of rs
watt nitrogen-dlled lamp. developed
by s. D. Rodgers. radio amateur and
inventor of Pittsburgh. Mention was
made at the time Of an audion de-
tector which might possibly be con-
structed from . small automobile
headlight bulb. and further particu-
lars were promised as soon as an OPP
portunity could be found to expert
ment with same. Following this idea
Mr. Rodgers has constructed such an
audion, utilizing q to volt head
light bulb. having two filaments. one
being q DINNER and the other for or.
binary headlight use.
1.-The socket was removed by heating
and the leads from the two ailments
separated where they enter the bulb,
bringing one out for the grid, using
the headlight filament which Is OF
and is better suited for. that pur-
pose. Two leads are brought out from
the filament and the socket replaced
and sealed with sealing wax. A small
piece Of aluminium foil was fastened to
the outside Of the bulb ut the top and
q l000 Drought IrOul IL. 1hl9 10 ucCu
for the plate. The grid comes between
this and the nlament. However, should
the filament burn out any time, the
other one can be used and the burnt
out filament can be made to Act As the
grid by changing the position OF the
foil.
'sUsing this as a detector. signals
from the Arlington station were
Brought in very clear. About thirty
volts were required for the plate and
between four and six volts for the
filament. While this detector. In Its
V with a good grade Of psaienea. there is
no reason why 1t could not be i'm
proved upon. It is my intention to try
several different types Of such bulbs
with that end In View" II Mr.. Rodg.
ers' results are successfui. they will be
idea is worthy Of experiment. and II
any amateur cares to work along
these lines the editor would appfe-
ciate the opportunity OF publishing an
account Of his tests for the benefit OF
others who are Interested.
= small wooden box with q glass
cover. cotton Is packed around the
bulb. which adds to its safety as well
as helping to retain the heat, this
being. az you know. a factor n its
on the inside Of the box to binding
posts. which are Of the ordinary dry
battery variety. Small squares Of
one.sixteenth- Inch hber are glued to
the sides Of the box under these bind.
ing posts for better insulation. Fiber
washers are used inside the bog for
the same purpose. A strip Of bfass
il bent to . shape to At and two holes
are drilled therein to fasten the case
to the panel with two small brass
screws. A rectangular shaped open.
ing WAS cut IN the froiff az thu hnx
done 50 that when it il mounted on
the back Of q panel the glow can be
seen through similar opening cut in
the panel. The three binding posts
nections TO the fiIAm1nts. The two
on the other side are for connection
to the grid ana the plate.
This bulb works exceptionally
we'll since being mounted In this