TNeMreIe AND RADIO REVIEW VOLUME XXIII JULY 4th -DECEMBER 26th, 1928 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 11111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111 11I I l l I1I111I I l 1111111111111111111111111111111111I111111 INDEX VOLUME XXIII JULY 4th -DECEMBER 26th, 1928 i l l l l l l __ 111111111111111111111111111111111111111111111111111111111111111111111111111111 I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I 1111111111111111 r A.B. Products -H.F. Choke, 774 Brayton Trickle Charger, The, 08e Current Topics, 11, 43, 69, 109, 133, 167, 195, Abroad, Programmes from, 15, 45, 78, 105, 135, Bright Emitters as Rectifiers, 183 231, 255, 287, 317, 359, 391, 472, 603, 531, 169, 197,- 227, 257, 283, 319, 365, 393, 468, British Acoustic Film System, The (Talking 561, 587, 633, 661, 701, 727, 765, 795, 818, 505, 533, 565, 601, 635, 673, 713, 733, 761, Films), 842 850 797, 820, 860 Phototone System (Talking Films), 792 " Cylanite," 688 Programmes from (Editorial), 1 -Broadcast ('yldon Synchratune -, Brevities, 23, 54, 85, 117, 143. 177, Twin Condensers, 743 -, Sets for, 808 203, 233, 268, 296, 323, 363, 445, 481, 515. Accumulator Carrier, Weston, 564 543, 573. 599, 641, 682, 711, 745, 772, 805. Charging, 489 832, 865 Damped but Distoitionless, - Discharge, 749 - Equalising, 272 Broadcasting Monopoly, The (Editorial), 155 Davex Eliminator, 19 Knobs, Clix, 112 Scientific Foundations of, 728 Tuners, 564 - or -, Eliminator? 750 Stations, 206 -" D.C.5," A Batteryless Receiver for -Accumulators, D.C. House -lighting, 240 -Broadcast Receivers, 6S, 175, 593, 97, 776 Mains, 60, 300 -, ILT., 240 -- Reception, Directive, 659 D.C. Mains Receivers, 221 -? Mains or, 582 Brown " L.F." Transformer, 639, 744 Resistance of Copper Wire, The (Useful A.C. Eliminator, Choosing an, 450 " !Nigro " Baseboard Neutralising 41 - Condenser. Data Chart), 360 - Filament Heating, 240 " Safety Fuse llolder, 836 -- Resistance of Resistance Wire (Useful Data Gramophone Amplifier, 755 Burndept Electric Sound Box. 234 Chart), 388 - In Favour of (Some 232 -, Useful hints), H.F. Choke, 510 Deaf, Aid to the, 448 Interference, Eliminating, I IS - Wander Plugs, 112 " Decoupling " a Screened Valve, 548 - " 112 " Aconicab Cabinets, -Buyers' , Incorrect, 522 Guide, 1928 -29, 663 A.C. Receiver, An All -wave, 272 Buzzer 652 -" De- coupling " A, or Heterodyne? Tip, 211 " A.C.3 " Receiver, 274, 692 Defective Winding, A, 490 " A.C.2," 214 Detection and Signal Strength, 183 A.C. Valve Problem, An, 27 Cabinet, A Fabric -covered, 71 Detector, An Unsuitable, 211 Valves, 691, 750, 807 " Battery, B.B.C., 509 Detector Bias, Determining, 212 -Advance Three -valve The Portable, (Broadcast Loud Speaker, Ormond, 71 ----, Fading and the, 485 Receivers), 68 -Cabinets, Smith's, 837 - , Screened Grid a, 492 Valve as Advertise Programmes? Should the B.B.C. Cabinet Type Receivers (Buyers' Guide), 663 - - - -, The Choice of a (Compromise in Receiver (Editorial), 800 Cables, Wireless and, 168 Design), 127 Aerial and its Electric Field. The, 141 Canadian Broadcasting Stations, 207 Underloading a, 548 Coupling, A New, 65 capacity Effects, 212 " Devicon " Condenser, A New, 42 - Down Lead, 867 The, Car Battery, The, 622 Diameter of Wire or Strand to give Coil of - -Earth Connections, 548 -- Cason Valve Holders, 610 Minimum H.F. Resistance (Useful Data Mast, Fixing the, 0 Catalogues Received, 20, 42, 140, 278, 355, 510, Charts), 834 -Aerials, Directional, 151 564, 658, 700 - of Wire to give Coil of Minimum 11.F. Re- , Indoor, 27 Ceylon, Broadcasting Stations in, 207 sistance (Useful Data Charts), 864 -Aerial Tuner, New range, 837 Two- Change -over, A Quick, 28 Differential Reaction, 720 Tuning Condenser, The, 152 Changing Over, 522 Dimic Three, The Screened (Broadcast Re- -Aermonic Earthing Switch, 174 Charge- Discharge Meter, A, 867 ceivers), 175 Allocation of Wavelengths for Broadcasting Charging, Accumulator, 489 Diode, The Distortionless, 783 (Editorial), 751 ('harts, Useful Data, 38, 82, 110, 126, 158, 204, Direct Coupling System, A (No. 289,217), 598 All -wave A.C. Receiver, An, 272 252, 294, 360, 388, 483, 500, 580, 596, 648, Directional Aerials, 151 Four," The, 28, 720 680, 717, 769, 834, 864 -- Directional Signalling (No. 285,169), 132 Four," The New, 13. 212 Choosing a Circuit, 522 Direction Finder for the Experimenter, Radio, -H.F. An. 151 77:1 Unit, Christmas and Radio (Editorial), 186, 2.47 -" " Tuner, 510 -, Radio Gifts for, 780 Directive Broadcast Reception, 659 Aluminium Cabinets, " Stella,' 140 Circuit Diagrams, Reading, 246 Discharge Rate, 750 Panels, Finishing Copper or, 142 Circuits, Simplifier, 741 Disconnected I :rid. A, 211 -Amateur -hand 537 Wavemeter, Climax H.F. Choke, 639 l)isb,rtiouless Detection, 652 Ammeter, Milliamps on an, 88 Clix Accumulator Knobs, 112 - Diode, The, 783 Amplification Limit, 328 Club News, 21, 37, 84, 116, 196, 288, 355, 392. " Doric " Cabinets, 564 Amplifier Input Connections, 760 520, 547, 560, 592, 634, 686, 702, 732, 766, Double- acting Reed Unit, 262 Anode Bend for Volume, 691 786, 817 - - -Capacity H.T. Battery, Ripault, 640 Feed Resistances, " Berclif," 72 ('oil Drive Loud Speaker, Marconiphone, 293 Dropping Volts' 724 - Resistance, Lisser, 173 Coil A, 457 Winding Hint, Dry Batteries aro Best, When, 454 - 692 Resistances Six -pin 325 - and Short Waves, Colvern Base, - Cell 11.1'. Batteries, 815 Anti -capacity Switches, Wearite, 688 Commercial Wireless, A Year's Progress in, 801 Dull Impedance Coupling, 775 Valve Holder, Pye, 41 Common -wave Broadcasting in Germany. Dubilier Anti- Interference 'Unit, 10 - 11) -Interference Unit, Dubilier, Experiments on, 554 -- Components, Two New, 509 - -Mobo," R.I. 261 Competition, Olympia Varley, Show. The II'irele.N - New, 41, 112 Apparatus, World. 301, 330, 371, 460. 491, 623 Argentine Amateurs, 390 , Olympia Show, The Winch..+ B'orld, Re- Earthing Switch, Aermonic, 174 Armchair Wireless, 81 sults, 624, 703 - -- Tube Connection, 9 Australia, Broadcasting Changes in, 131 Compromise in Receiver Design, 91, 127, 163. Earth System, The, 807 Australian Broadcasting Stations, 207 189, 242, 289 " Ebonart," Redfern's, 509 Automatic Tuner, 20 Condenser Insulation, 548 Ebonite? Wood or, 582 Cone Loud Speaker Unit, " Beam," 538 Echoes from the Depths of Space, 722 Connections, Testing, 27 Eckersley, Captain P. P. Reminiscences of, 376 Back -coupling in Eliminators, 381 Continental Programmes, 15, 45, 73, 105, 135, Editorial, 1, 29, 59, 89, 121, 153; 185, 213, 241. -coupling through Phone Leads, 272 169, 197, 227, 257, 283, 319, 365, 393, 468, 273, 301, 329, 371, 449, 491, 523, 549, 583, -Ballot Result of 623, 653, Olympia Competition, 703 505, 533, 565. 601, 635, 673, 713, 733, 761. 693, 721, 747, 751, 779. 8119. 841. Baseboard Neutralising Condenser, .Bnlgin, 41 797, 820, 860 Edward's Unspillable Accumulator, 72 Battery Chargers (No. 284,306), 22 Control Room, The (Editorial), 121 Eelex Earth, 262 - Lead, A Novel, 33 Copper or Aluminium Panels, Finishing, 142 Electric Field, The Aerial and its, 141 Batteryless Receiver for D.C. Mains. A'(D.C.S), Copper Wire, The D.C. Resistance of (Useful --Sound Box, Burndept, 234 60 Data Charts), 360 - Supply Mains, Valve Current from, 213 Battery Receiver Unit, A (No. 290.350), 754 Corrected L.F. Amplifier, A, 28 Electricity Supply Companies, Mains, Cults, and, - Resistance, 152 Correspondence, 26. 56, 86, 119, 149, 181, 200, 310 Testing (No. 285,622), 132 239, 270, 298, 326, 360, 447, 487, 519, 530, - Supply Ramp, An (Editorial), 29 -B.B.C. and Television, The 540 089, (Editorial), 576, 620, 650, 747, 777, 794. 838 Eliminating A.C. Interference, 148 B.B.C." Cabinet Battery," 509 Cossor Screened Grid Valve, S.G., 220. 767 Morse interference, 868 Control Room, The (Editorial). 523, 583 Coupling by Grid Leak and Condenser, Effi- Eliminator Breakdown, An, 212 -" Beam " Cone Loud Speaker 538 648 - - Mega Unit, ciency of (Useful Data Charts), vox, 787 " Berclif " Anode Feed Resistances, 72 Courtney Flight, Wireless on the, 279 -, Ohio's Law and the, 490 Berlin Show, Impressions of the, 306 Crystal and Pentode, 692 - or Accumulator? 750 Bias for A.C. Valves, 691 -, Another Use for the, 652 Eliminators, Back -coupling in, 381 Bias for Screened Valves, 651 Detector, A Suggested Explanation of the. Emission, Lost, 58 Binocular Choke, McMichael, 687 629 Empire Broadcasting (Editorial), 583, 698 Books Received, 256, 282, 387, 502, 572. 658 Crystal Holder, Piezo (No. 277,330), 754 " Empire " Receiver, The New; 854 Book Reviews, 387, 629, 819 - Set, A Short -wave, 152 -Set on 150 Metres, The, 521 ?LOH ppv-p7 rt 3 www.americanradiohistory.com.. R.'i F (G Energising Current, 778 independent Volume Control for Several Loud Moving -Coil Loud Speakeri, Resonance in, 497, Discharge, 272 Speakers, 180 b39 Equalising Accumulator of Europa III, The, 694, 737 India and Ceylon Broadcasting Stations in, 207 -Coil Loud Speaker, The Impedance a, European Broadcasting Stations, 206 Indoor Aerials. 27 ' 729 " E eryman Four " on a Frame Aerial, The. Aerial Tip, An. 58 - -Coil Modifications, .122 - Capacity and Frequency (Useful --Coil Supports 375 370 Inductance, --Portable " Circuit, The, 778 Data l'harts). 82, 110, 12G -- Coil, The Output Stage and the, 154 Exhibition at Olympia, Index to, 357 Input, Impedance and. 300 - - Coil with 2,500 Turns, Winding a, 353 Expanding Screwdriver, 205, 293 Inter -circuit Coupling, 211 Mollard P.M. 4D (Valves We Have Tested), 9G Experimental Licences, New Conditions for, 318 lutcrvalve Transformers (No. 287,191), 179 P.M. 12 (Valves We Have Tested), 25 Exponential Horn, Folded, 140 Inventions, Recent, 22 67, 132. 179, 208, 598. Multilayer Coils, Self- inductance of (Useful Data Extension for Telephones on Loud Speaker Set. 754. 814 - Charts), 769 251 Multiple -Unit Valve Sets (No.