20 Cents RADIO October 1921
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HAN ALL OTHER. RADIO MAGAZINES COMBINED 20 Cents RADIO October 1921 Over 100 Illustrations Edited by H. GERNSBACK NEWSREG. U.S. PAT.OFF. A NEW LOUD TALKER SEE PAGE 286 www.americanradiohistory.com UNNINGHAM TUBES MEET EVERY AMATEUR REQUIREMENT The trade -mark GE is the guarantee of these quality tubes. Each tube Is built to most rigid specifications. C300 C301 C302 C303 C304 Gas Content Pliotron Type 6 Watt Power 50 Watt Power 250 Watt Power Detector Amplifier Tube Tube Tube Filament Terminal Voltage 5 V. 5 V. 7.5 V. 10 V. 11 V. Filament Supply Voltage 6 V. 6 V. 10 V. 12 V. 12 V. Filament Current 1.0 amp. 1.0 amp. 2.35 amp. 6.5 amp. 14.75 amp. Plate Voltage 18 to 25 V. 40 to 100 V. 350 V. normal 1000 V. normal 2000 V. normal Plate Current / to 1 milli. amps. 1 to 5 milli. amps. .045 amp. .15 amp. .25 amp. 21,000 ohms at 40 Output Impedance 10,000 ohms Volts 4,000 ohms 6,000 ohms 14,000 ohms at 100 Volts Amplification 6.5 to 8 at 40 V. 7.5 Constant 8to10at100V. 10 25 Watts Output 5 normal 50 normal 250 normal Dimensions (overall) 1j"x45,1 eV 1Y4'"x45ie" 2'rá "x5 /" 2 "x73 "" 5 "x1434" Base 4 Prong Standard 4 Prong Standard 4 Prong Standard 4 Prong Special Special Mounting PRICE $5.00 $6.50 $8.00 $30.00 $110.00 Cunningham Cunningham C -3uu Amplifier Detector Pliotron Type Gas Content C -301 DEALERS: Standard Packages'-F. O. B. Cleveland, San Francisco, Chi- cago, New York. Broken Packages F. O. B. San Francisco and Chicago. Cunningham C -302 6 Watt Power Tube Cunningham E. T. CUNNINGHAM C -3'13 60 Watt Power Tube Trading as Audiotron Mfg. Company Suite 191.5 Cunningham C -304 35 Montgomery St., San Francisco 260 Watt Power Tube Herbert H. Frost, Central and Eastern Representai. ±,e, 154 West Lake St., Chicago, Ill. www.americanradiohistory.com . 4 Radio Newa for October, 1921 275 of a thousand miles,' AJOURNEYsaid Lao Tzu, `begins with a single step!' 'Let a Grebe Receiver be the first step of your radio -journey- lest you be compelled to return and start anew." qr.ocT The (;R -9 Receiver is the ideal equipment for C.W. and radiophone reception. A Regenerative Receiver-15o to 3,000 Metres - moulded variometers, tapered -grip dials. rubber -tired verniers, direct -reading rheostat controls, automatic plug and jack filament control system. So simple to operate- connect antenne, ground, bat- teries- insert tubes -and listen! Ask your Dealer to show you this instrument or write tes for descriptive bulletin. A. H. GREBE & CO., Inc., Richmond Hill, N. Y. The Sine of (0} The Right Kind www.americanradiohistory.com all, cash or cash equivalents and all re prohibited. rNAT1ONALLY20 POUND WEIGHT scíflc prohlbitlonslnsstrlctions may al Mall Manual OMM) country pages for Country of Oestin bor; Pays de destlnstlon affix customs declaration PS Form 2976-A customs form pouch. L liMMEMEMEIMMENEMIIII !!R10!® MAIL ,I 'TES POSTAL SERVICE n Flat Rate Box c and International Use 3PS packaging products have been awarded Cradle Cradle Certificationsm for their ecologically intelligent sign. For more information go to mbdc.com/usps klie to Cradle Certd ìu& is a certrf,catbon mark or MBDC www.americanradiohistory.com CIRCULATION LARGER THAN ALL OTHER RADIO MAGAZINES COMBINED 20 Cents RADIO October 1921 Over 100 Illustrations Edited by H. GERNSBACK NEWSREG. U.S. PAT.OFF. A NEW LOUD TALKEA SEE PAGE 286 www.americanradiohistory.com TUBES MEET EVERY AMATEUR REQUIREMENT j The trade -mark GE is the guarantee of these quality tubes. Each tube is built to most rigid specifications. C300 C301 C302 C303 C304 Gas Content Pliotron Type 5 Watt Power 50 Watt Power 250 Watt Power Detector Amplifier Tube Tube Tube Filament Terminal Voltage 5 V. 5 V. 7.5 V. 10 V. 11 V. Filament Supply Voltage 6 V. 6 V. 10 V. 12 V. 12 V. Filament Current 1.0 amp. 1.0 amp. 2.35 amp. 6.5 amp. 14.75 amp. Plate Voltage 18 to 25 V. 40 to 100 V. 350 V. normal 1000 V. normal 2000 V. normal Plate Current / to 1 milli. amps. 1 to 5 milli. amps. .045 amp. .15 amp. .25 amp. 21,000 ohms at 40 Output Impedance 10,000 ohms Volts 4,000 14,000 ohms at ohms 6,000 ohms 100 Volts Amplification 6.5 to 8 at 40 V. Constant 8to10at100V. 7.5 10 25 Watts Output 5 normal 50 normal 250 normal Dimensions (overall) 1Wx4518" 1 "x45io" 23' x534° 2 "x7 4 5 "x1434" Base 4 Prong Standard 4 Prong Standard 4 Prong Standard 4 Prong Special Special Mounting PRICE $5.00 $6.50 $8.00 $30.00 $110.00 Cunningham Cunningham C -300 Amplifier Detector Pliotron Type Gas Content C -301 DEALERS: Standard Packages B. Cleveland, San Francisco, Chi- cago, New York. Broken. Packages F. O. B. San Francisco and Chicago. Cunningham C -302 Hatt Power Tube Cunningham E. T. CUNNINGHAM C -3'l3 50 Watt Power Tube Trading as Audiotron Mfg. Company Since Cunningham C-304 35 Montgomery St., San Francisco 250 Watt Power Tube Herbert H. Frost, Central and Eastern RepresentaLi :ìe, 154 West Lake St., Chicago, Ill. www.americanradiohistory.com Radio News for October, 1921 275 A JOURNEY of a thousand miles,' said Lao Tzu, `begins with a single step!' "Let a Grebe Receiver be the first step of your radio - journey - lest you be compelled to return and start anew." qrct,tyr The CR -9 Receiver is the ideal equipment for C.W. and radiophone reception. A Regenerative Receiver -i 5o to 3,00o Metres - moulded variometers, tapered -grip dials. rubber -tired verniers, direct -reading rheostat controls, automatic plug and jack filament control system. So simple to operate- connect antennae, ground, bat- teries- insert tubes -and listen! Ask your Dealer to show you this instrument or write us for descriptive bulletin. A. H. GREBE & CO., Inc., Richmond Hill, N. Y. The Sine of EB} (411"7- The Right Kind www.americanradiohistory.com 276 Radio News for October, 1921 4.41)'.4;vr-9 `6 ) ktIto EMIR' offerc ilie opportunity Dr. T. O'Conor Sloane Will Teach You Chemistry Right In Your Own Home Dr. Sloane will teach you Chemistry by a practical, intensely interesting method. Our home study course written by Dr. Sloane READ WHAT ONE OF himself is practical, logical and remarkably simple. It is illustrated OUR STUDENTS SAYS: by so many experiments that are performed right from the start (This Leiter was Positively Unsolicited) that no one, even with the most common education, will have any Phoenix, Ariz.. trouble Sept. 8. 1921. in mastering this science. Dr. Sloane teaches you in your Chemical Institute of N. Y., own home by the same successful system by which he has already New York City. taught thousands in the class room. This method is a short cut Gentlemen: -Just about this gained through years of experience time with most courses is the which will save you weeks of time when you feel like "cuss- time. And, Dr. Sloane personally examines and corrects all exami- ing." I had struggled with sev- nation papers, pointing out your mistakes and correcting them for eral books in chemistry up to you. This personal training will be of inestimable value in your the time I started this course future career. and was just about disgusted with them all. But say! this is just like reading some fascinat- ing fiction story. Perhaps this is somewhat strong language but Earn Big Money it expresses exactly what I mean. All of the frocks and /DR. T. O'CONOR SLOANE Many industrial firms pay their chemists as high as $15,000 a frills have been left out and the A.B., A.M., LL.D., Ph.D. \ year. Salaries of $10,000 to $12,000 a year are very common. bare facts are printed so an or- dinary human can understand Noted Instructor, Lecturer and Why be satisfied with small pay and hard, thankless work -be them without losing all the re- Author. Formerly Treasurer Ameri- your own boss and train yourself in a few short months to have ligion and bringing up he pos- i can Chemical Society and a practical a real profession. The work of the chemist is extremely inter- sesses. As a rule I am not chemist with many well known esting. If you are fond of experimenting, if you like exciting and much on bragging about any- 'achievements to his credit. Not thing but this is too good to only has Dr. Sloane taught chemis- intensely interesting work, take up Chemistry. To the man who keep to myself. I was planning try for years but he was for many is dissatisfied with his present job, to the young man just deciding on taking a course in Chemistry years engaged in commercial on his life at High School chemistry wnrk. work, Chemistry holds alluring charms, and counties_ this year but opportunities. If you want to earn more money, the way is open "they will have to get up pretty early in the morning" to pro- through our course in Chemistry. duce a course that will even start to compare with this. Sincerely yours, Good Chemists Command High Salaries (Signed) FOREST BAKER. Now Is The Time To Study Chemistry Never before has the world seen such wonderful opportunities for chemists as exist today. The war has awakened the United States to the need of trained chemists and chemical engineers.