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RADIO BROADCAST ADVERTISER
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ECONOMICAL operation of UV 199 tubes requires a seriesmultiple connection of dry cells. Difference in age and voltage existing between separate series lines will cause current to flow through the multiple connections even when the battery is apparently standing idle, ruining the cells and causing them to disrupt and discharge electrolyte to cause damage. The diagram shows a trouble proof arrangement for running UV 199 tubes on a series-multiple connection of six cells using a knife switch to open each series line of cells making interaction impossible when the battery is not in use. Similar arrangements will work with any multiple battery and any tubes. No better circuit breakers can be had for such a purpose than MAR-CO MINIATURE KNIFE SWITCHES. They are made with one, two, or three blades, either single or double throw, are substantially made, handsomely finished in polished nickel and list from sixty cents to one dollar and a half.
FOR the ordinary three tube panel mounted set the MARCO ROTARY DOUBLE POLE DOUBLE THROW SWITCH is well adapted where six cells are used as in the sketch. This instrument mounts through one drilled hole in the panel, is operated with a handsome bakelite knob and lists for one dollar and a quarter.
See them at your dealers. MARTIN-COPELAND COMPANY
PROVIDENCE, R. I., U. S. A.
Approved by Radio Experts for Radio Amateurs
Approved because: —
Wave length is 550 Meters; 16 soldered leads; straight wound stator on genuine bakelite tubing; kiln dried rotor; Fahnestock spring clip connections; non-conductive adhesive; You can
GET ONE FOR $3.50
20 DIAGRAMS FREE WITH EACH
For sale at your dealer's — otherwise send the $3.50 directly to the manufacturer and you will be supplied postpaid.
G. H. Fischer & Co.
123 Liberty Street New York City
Give it
Every Chance!
If you want your radio tubes to function at the highest degree of efficiency— totally free from body capacity effects — panel your set with this remarkable material.
bakelite sdilecto
(A Laminated Phenolic Condensation Material)
The X-X grade of Bakelite-Dilecto is absolutelyperfect for radio paneling. Unaffected by heat, cold, water, oil, solvents or milder acids. Highest in dielectric strength. Cannot warp or swell. Finished a handsome, sleek black. Amazingly tough, yet readily machined. Ask any electrical man to get Bakelite-Dilecto, X-X, cut to size for you.
The Continental Fibre Company
Factory: Newark, Delaware
Service from:
New York. 233 Broadway San Francisco, 75 Fremont St.
Chicago. 332 S. Michigan Ave. Seattle, 1041 Sixth Are., So. Pittsburgh, 301 Fifth Ave. Los Angeles, 411 8. Main St.
^ Tested and approved by Radio Broadcast -^r