R- Theiltpí and RADIO REVIEW R
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r- TheIlTPí AND RADIO REVIEW r VOLUME XXIV JANUARY 2nd -JUNE 26th, 1929 ALL RIGHTS RESERVED Published from the Offices of " THE WIRELESS WORLD " ILIFFE & SONS LTD., DORSET HOUSE, TUDOR ST., LONDON, E.C.4 www.americanradiohistory.com - 4 nf ?' 4 ; 44 ' ' www.americanradiohistory.com 111111 i I I I iii 111111 11111 111111 III 111111 11111 I II I II I II I I III IIIIIIIIIIIIIIIIIIIIIIIIl1111111111111111111111illlllllllllllli' INDEX VOLUME XXIV JANUARY 2nd -JUNE 26th, 1929 (IIIIIIIIIII'IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII1IIillIIII- Abets, Using the (Readers' Problems), 24 Cabinet Dimensions (Readers' Problems), 272 " Diode " Receiver, A Sensitive, 54 Abroad, Sets for, 473 - Effect of the, 213 Diode Rectifier, The (A Description of the "Kirkifier, ") Accumulator Charge, Duration of (Readers' Problems), " Cameo " Riverside Portable Case, 602 32 344 Canada's Quarter Million Licences, 211 Direction Finder, Portable, 614 Accumulators, Edwards Portable Set, 603 " Carco " Switches, 625 Directional Stations, Useful Aid for (Review), 516 " Topping " (Patent), 401 Carrier for Picture Receiver, 135 Distant Reception (Editorial), 215 -"Acoustics of Buildings" (Book Review) 623 Catalogues Disto 492 Received, 74, 334, 393, 411, 584, 599, 621, Fillers, A.C. High Frequency Valve, 883 648, 673 Distortion, Detecting (Readers' Problems), 84 "A.C.3," An Unstable (Readers' Problems), 112 Centralab Products, 135 of Piano Music (Readers' Problems), 473 -A Screen Grid (Readers' Problems), 237 Chakophone de Luxe Aerial Tuner, 393 -Double -Tuned Couplings (Readers' Problems), 83 A.C. Three, The Flat Dwellers', 450, 481. Charge Indicator, A, 522 Volume Control (Readers' Problems), 422 Three, The Flat Dwellers' (a Correction) 632 Changing Condensers (Readers' Problems), 498 -Dropping Volts, 213 - Valves, The New, 682 Dry Cell 48 Charging the Feed Condenser (Readers' Problems), 608 H.T. Batteries, -Adding a Tuned Aerial Circuit (Readers' Problems), 497 Charts, Useful 441, Dubilier H.F. Chokes, 77 Data, 43, 97, 120, 209, 316, 363, H.F. to the Pentode Two (Readers' Problems), 190 540, 668 " Toreador Screened Grid Four " (Kit Con- - H.F. Difficulties (Readers' Problems), 84 Choice of Valve Notes), 533 H.F. (Readers' Problems), 112 - structors' -Aerial Chaos in Paris, 390 Choke Coupling (Readers' Problems), 112 Dynamic Resistance, 274 Coupling, Continuously Variable (Readers' Pro- Filter, The, 54 - blems), 631 - Inductance, L.F. (Readers' Problems), 320 Loading, Reducing (Readers' Problems), 680 -Chokes, Iron Cored, carrying D.C. (useful data Charts), - Tuner, Chakophone de Luxe, " Earth," The Best, 320 393 668 - Tuning Unit, Tapped, East Coast, On the (Kit Constructors' Problems), 307 318 H.F. (Readers' Problems), 473 462 - Wire, Renewing (Readers' Problems), 287 Choosing Eastern Europe, Wireless in, - a Power Valve for the Reed Driven Loud Economy Measure, An (Readers' Aerials- for Broadcasting Stations (Editorial), 113 speaker, Problems), 111 298 Ediswan Pentodes (Valves We Have Tested), Indoor (Readers' Problems), 84 the Right Valve, 168 342 - Short (Readers' Problems), 24 Clear Valves Edwards Portable Set Accumulators, 603 - Glass (Patent), 401 Aermonic- Screen grid Valve Ekco H.T. Supply Unit, Model 3 F.12, 537 Holder, 602 Cleary Wet H.T. Batteries, 206 Election, U.S. Presidential, 36 Alarm, A Piezo -Flectric (Patent), 226 " Clix " Power Plug and Socket, 134 All Electric Amplifier, 634, 677 Clix Wood Electramonic D.C. H.T. Eliminator, 625 -screw and Parallel Pin Plugs, 353 Eliminators and Battery Chargers, 566 All -Wave Four, New (Readers' Problems), 448 Clubs, News from the, 20, 42, 130, 236, 253, 304, 467, -Electrical Reproduction of Sound (Editorial), 239 Altering an Elirnator, 344 536, 552 Electric Pick Problem " Always " Potential Divider, 513 Coil Connections 474 " -Up " (Patent), 652 (Readers' Problems), Supply Regulations, 53 Amateur Band Wavemeter, 493 Connections, Reversed (Readers' Problems), 631 -Electrostatic Loud Speaker, Vogt, 553 Status in Britain (Editorial), 633 -Coils and Screens (Readers' Problems), 272 -Amplification from Screen -Grid Valves, Eliminator, Altering an, 344 More, 458 for Europa III, 104 Design (Readers' Problems), 498 (See also under H.F. Amplification) -Colato Loud Speaker, 353 - D.C., 53 Amplifier, The, 234 Collett's " Eze -Way " Pulley, 207 - D.C. Junior (Readers' Problems), 632 L.F. Dessigning, 862 " Coltags," 603 - for Two -Valve Sets, An, 529 - (See also under H.F. Amplifier and L.F. Columbia H.T. Battery, Type No. 4,721, 460 - Output Voltage (Readers' Problems), 11.2 Ampl$rer) Colvergraph, The, 331 -Eliminator Voltage, Increasing, 213 Anode Bend Detection (Readers' Problems), 660 Combination Set (Readers' Problems), 111 Voltage Bend Detector, The Valve as an, 279, 326 Combining Measurement (Readers' Problems), 684 Output Choke and Output Transformer, 491 -Eloden Loud Speakers, 284 - Bend or Leaky Grid ? (Readers' Problems), Common 422 Batteries, 54 Empire Day, 1929 (Editorial), 523 - Current Variations (Readers' Problems), 394, 546 Composition of the Programmes (Editorial), 345 - Resistance and By-Pass Capacity (Readers' Condenser Receiver, New (Readers' Problems), 296 Plates, Mounting (Patent), 652 - Screened Four, Burndept (Broadcast Receivers), - Problems), 140 Condensers, Changing (Readers' Problems), 498 - 302 Aperiodic H.F. Amplification with Modern Valves, 173 Decoupling (Readers' Problems), 344 Erring Neighbour, An (Kit Constructors' Problems), Apparatus Reviewed, 410, 513, 585, 602, 624 - Testing (Readers' Problems), 370 222 Are Aerials Out of Date ? (Editorial), 573 -Cone Lóud Speaker, The, 208 Art et Technique Variable Condenser, 392 Continuously Variable Ether Congestion (Editorial), 142 Aerial Coupling (Readers' Eton " British Valves " (Valves We 75 Artificial Condenser (Readers' Problems), 447 Problems), 631 Have Tested), Avometer, 187 Control Primary H.T. Battery, 160 of Grid Voltage (Readers' Problems), 320 -Europa Portable, The, 500 Automatic Control (Readers' Problems), 189 Conversion, A Simple (Readers' Problems), 320 Coils for, 104 Auto -Fuse, Magnum, 625 " Corked " Aerials 473 III, (Readers' Problems), - III, Screen for, 104 Correspondence, 23, 50, 81, 110, 138, 164, 188, 212, -" Europa III," The (Readers' Problems), 24 235, 270, 294, 343, 366, 417, 444, 471, 496, 520, Batteries, Common, 54 European Broadcasting (Editorial), 609 569, 606, 629, 656 -Wave Bayliss Power Chokes, 624 Cossor L.F. Transformer, 672 " Everyman Four," Long (Readers' Problems) B.B.C. Policy (Editorial), 449 Melody Maker on 112 Ultra -Short Wavelengths (Kit Four " Reaction (Readers' Problems), 571 " Beamu " Pick -Up Carrier, 206 - Constructors' Notes), 221 ' - Four," Rebuilding the, 213 Berclif H.F. Choke, 393 Melody Maker, The New (Kit Constructors' - Four," Short-Wave, 632 Bias Battery Tricks (Readers' Problems), 369 - Notes), 92 -" Exact " Tuners, The, 105 Fallacy, A (Leaders' Problems), 238 Couplings H.F. Parallel Feed (Readers' Problems), 660 -Book Reviews, 264, 420, 616, 623, 637 Courting " Excess Stability " (Readers' Problems), 272 Failure (Readers' Problems), 631 Exide Unspillable 602 Books Received, 42, 76, 184, 420, 432, 671 Current Topics, 13, 41, 65, 94, 123, 159, 185, 197, 227, Accumulator, ` British General " Transformer, 207 258, Extending Wavelength Range (Readers' Problems), 285, 805, 329, 355, 379, 404, 436, 461, 421, 497 Industries Fair, Radio at the, 195, 223 487, 512, 535, 559, 578, 622, 645, 674 -Broadcast Brevities, 21, 51, 72, 109, 136, 205, 232, Cushions Extra L.F. Stage, An (Readers' Problems), 448 267, and Acoustics (Book Review), 623 " Eze -Way Collett's, 207 295, 312, 317, 368, 391, 415, 440, 468, 494, 617, Cutting Piezo Crystals (Patent), 558 " Pulley, 544, 567, 601, 626, 653, 676 Cylanite, 234 Licence Conditions, New (Editorial), 395 - Pictures, Receiving (Patent), 558 Fading, 54 - Receiver for the Deaf, 495 Danish Broadcasting, 643 False Assumption, A, 522 - Receivers, 70, 128, 302, 542, 568, 667 Deaf, Broadcast Constructors' Receiver for the, 495 Ferranti Screened Grid Three (Kit - Troubles in America (Editorial), 475 " Decoupling " a Portable (Readers' Problems), 884 Notes), 433 - Waveband, The (Readers' Problems), 474 Decoupling Condensers (Readers' Problems), 344 Valve Tester, 459 Broadcasting Relations Overseas (Editorial), 321 Resistances (Readers' Problems), 608 Fictitious Fault, A (Readers' Problems), 394 Stations, Aerials for (Editorial), 113 - Where it Scores, 53 Filament Voltage, Reducing (Readers' Problems), 447 Buenos Aires, Nauen to (A New Telephone Service), 73 -D.E.L. 610 and H.L. 610 (Valves We Have Tested), 19 Filter Unit, " Wearite," 319 Building a Picture Receiver, 2, 26 Demonstration Receiver, The Schools', 372, 427 Fire -Screen Loud Speaker Baffie, 439 Bu/gin H.F. Choke, 284 Detecting Distortion (Readers' Problems), 84 Flat- Dwellers' A.C. Three on an Open Aerial (Readers' Quick -Break Switch, 411 Detector Efficiency (Editorial), 523 Problems), 545 -Burndept Cabinet Cone Loud Speaker, Model 16'76, ; Efficiency, Improving, 524 " Flat -Dwellers' " A.C. Three, The, 450, 481 Correc- 565 -Detex R.C.C. Unit, 186 tion, 632 Empire Screened Four (Broadcast Receivers), 302 Diamond Accumulators, 565 Flat Tuning Wanted (Readers' Problems), 546 - Screened Portable, 682 Differential (Kit Reaction Control (Readers' Problems), 572 Follow the Specification Constructors' Problems), - Turntable, 603 Difficult Conditions (Readers' Problems), 238 642 -Buyers' Guide to Portable Sets, 1929, 585