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WHEN YOU BUY
POLYMET PKODUCTS
YOU GET
Quality Products
As Dependable as Observatory Time
In fact, when you incorporate Polymet electric set essentials in the sets you build, you are using parts that over 80% of the large radio manufacturers specify for their sets.
Elaborate tests and experiments by their engineers have warranted this stamp of approval. In your sets, follow the leaders to Polymet Products.
Send for the Polymet catalogue now
POLYMET MANUFACTURING CORP. 829-E East 134th St. New York City
POLYMET PRODUCTS
The Greatest Money Value in Matched Instruments
Electrical units of measurement are not subject to change. But electrical quantities can, and do, vary widely when measured with unreliable instruments.
Why gamble with inferior products when Weston instruments insure life-time accuracy at a very moderate cost?
Moreover, the use of bargain instruments sooner or later results in ruined equipment and big repair bills.
Think before you buy, and then buy dependability. Write for Circular J on Weston Radio Instruments.
Weston Electrical Instrument Corp. 604 Frelinghuysen Ave., Newark, N. J.
WESTON
RADIO INSTRUMENTS
Get ShortWave AND Broadcast Get Them with a B-Eliminator
It gets short-waves AND Broadcasts All in One
Write us today for full details
Here's humless short-wave loudspeaker operation on a B-Power Supply, — another NATIONAL achievement. Here's a new NATIONAL THRILL BOX embodying full range reception over both short-wave and broadcast bands. And it operates perfectly from the NATIONAL Velvet-B power supply. You will get a brand new kick out of the fine tone and different performance of this
4 Tube THRttt BOX S. G. 4 NATIONAL CO. INC., Maiden, Mass.
Est. <jg> 1914
UNIFORMLY GOOD
I^IKE a seething 'melting pot% with science ceaselessly checking each crucible — the Arcturus Laboratory, as a result of its research and pioneering, gives the radio world, in Arcturus A-C Long Life Tubes, a product that is uniformly good.
Rigid tests and specifications, jealously guarding an enviable reputation, do not cease with one type of tube — they go on and on for every tube.
. . . oxides that are put through sieves, so fine they hold water . . . parts that are proven with 'go and no-go gauges', where even a hair-line makes a vast
difference ... special production units diligently supervised by efficient laboratory engineers . . . specified filament, metal and glass construction . . . the most minute evacuating process known to science ... to give the ucorld uniformly good A-C tubes.
Critical set engineers have been quick to grasp tbe value of such service and its significance in set efficiency.
Arcturus has struck the keynote in perfect tube production . . . with ARCTURUS A-C LONG LIFE TUBES.
©I
ENGINEERING FACTS HAVE A UTILITY SIGNIFICANCE TO THE BROADCAST LISTENER.
J®
T T A
ARCTURUS RADIO TUBE CO. NEWARK, N.J.
ARCTURUS
BLUE loncCufe TUBES
▼ T A
• may, 1929
page 51 •