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The Quiz Pot (Continued from page 32) bit of work but is worth it as we gain a lot of room in my small projection room." The accompanying photographs indicate not only a lot of uwrk but S07ne very fine workmanship and careful pla7ini7ig. We note the grill work on the "operating" side and a triple row of perforations near the top of the base on the "nonoperating" side, undoubtedly for the purpose of ventilation which is very essential. We predict that equipment manufacturers will take heed of Ray's idea since it represents a very practical use for what has long constituted waste space. Projector bases are usually designed for universal purposes, i. e.. for use with any and all types of current supply and lamp equipment. Frequently, generator equipment is used, and when it is, the DC is broken by the large switch mounted on the base. Since relatively heavy amperage at low voltage is involved, the large Knife type switch is needed. On the other hand, with a specialized set-up like Ray's, using a single-phase 220-volt 9 amp. rectifier ivith the switch breaking the AC, we tvould be in favor of a much smaller switch, permitting a tnore compact installation, although it should have at least a 30-amp. rating as the "inductive kick-back" of the primary winding is a bit rough on contacts. Or, using the same switch, in the process of manufacture, provision could be made for the wiring to run directly from the inside of the base into the switch, thereby concealing all switch wiring. One popular type of base houses the sioitch which is operated by an external lever. With the thought of one manufacturer producing a complete base, rectifier, and lamp unit, we can go a bit farther and suggest extension of lamp ventilation into the base, affording a degree of forced draft for further tube cooling efficiency. Congratulations on a very fine streamlining job, Ray!— G.B. Here's a space-saving idea for the small projection room— installing rectifiers in the base of the projector. Submitted by Ray S. Hanson, Fertile, Minn., this indicates not only a lot of work but some fine workmanship and planning. different acceptance of almost any weird effect brought to his attention. Therefore we offer no apologies for our gullibility as, mopping our receding hairline, we studiously explore the possibilities of the described effect, finally emerging with our version of an explanation: Since the advent of theatre sound, it has teen generally conceded that a direct current source of excited lamp supply voltage is preferable to alternating current for the reason that there are certain disturbances present in the reproduced sound when 60 cycle AC is used, although in recent years advances in engineering have largely overcome the disadvantages. Some equipment manufacturers have solved the problem through increasing the frequency of the current supply, through the use of an oscillator, to approximately 20 kilocycles, and this type of exciter is rather widely used in 16mm equipment. Since a 20 KC note is "super-sonic"—beyond the range of hearing—whatever disturbances may arise therefrom may generally be disregarded, and exciter lamp operation on "raw AC" is thereby achieved with no detrimental effects. Moreover, the thermal lag of the exciter filament tends to eliminate photocell excitation at this frequency by the light source. Nevertheless, tests of such equipment have indicated that it is entirely possible for a 20 KC note to be introduced into the amplifier circuits through induction, and very strong signals at this frequency have been found to be present in the output circuit. It is entirely conceivable that current of this frequency, sufficiently amplified, could radiate a considerable distance under favorable atmospheric conditions perhaps with the speaker line acting as an antenna. With the oscillator and amplifier operating from a common power supply, we ponder the possibility of oscillator modulation resulting under which circumstances we come up with the thought of a "modulated carrier," a condition duplicating regular radio broadcast. And until someone proves our ex-GI a prevaricator or fabricates a better solution, we are doggedly clinging to our version as we have figured it out. In the meantime, we'll be looking for mail from our licensed radio amateurs of whom there are many among the projectionists.— G.B. EX-GI OPERATOR A story passed along by an ex-GI operator of a South Pacific island locale has plagued us no end for a possible solution. In all sincerity, the boy tells of operating 16mm sound equipment in the open air. and a public-address system several hundred yards away picked up and reproduced the sound. The phenomena of theatre sound equipment picking up and reproducing sound from regular radio broadcast stations is not new. but the idea of a motion picture sound system broadcasting to a public address system seems a bit fantastic. However, a couple of decades of association with the fantastic science of electronics would resign even the most dubious to in- Meeting recently to discuss the peculiar problems of acoustical design and theatre service in floating theatres, were the officials and engineers of the RCA Service Co. and the Grace Lines, pictured on the promenade deck of the latter's "Santa Rosa." Left to right are Josh Billings jr., RCA Service Co., Inc.; Frank Quinn, marine paint division of DuPont Company; O. B. Hanson, vice-president and chief engineer, NBC; Godfrey MacDonald, general traffic passenger agent, Grace Lines; Richard Carnis, RCA Service, and John Sullivan, purchasing agent, Grace Lines. 34 The MODERN THEATRE SECTION i
INVE5V DON'T INVITE TROUBLE Be sure the lamps you buy have a proven performance record . . . will stand up without constant, expensive replacement of parts. Investigate the reputation and integrity of the maker. Be sure that he will be there to furnish parts and render service when you need them. Demand a list of users and then ASK the men who own them. FOR DRIVE-INS & LARGE THEATRES THE STRONG MOGUL 70-AMPERE - 40-VOLT PROJECTION ARC LAMP Projecls 15,000 lumens — the maximuin that fUm will accept without damage — providing a brilliant picture on 48-foot and larger screens with all details clearly visible 500 feet or more from the screen. It is wasteful, as well as futile to burn more than 70 amperes in any reflector lamp, or twice the current in condenser lamps. ^ftle^^ STRONG SINGLE PHASE 80-AMPERE TUBE RECTIFIER FOR SCREENS UP TO 18 FEET IN WIDTH
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I I 6 \20TH'FOX UPS 1948-49 OUTPUT
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AnSWBr to SIMPP Suit ^"°*^^'' circ
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To that memorable list of superb ro
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LOS ANGELES' FOUR MUSIU HALLS UKOSS
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RKO Rushes Bookings On Mitchum Pict
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CHESTER FRIEDMAN EDITOR OKOffICi? H
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TOApNGEG-lST '^^^DS «/ COLUMBIA PI
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jJ!!?!en^ First Line Of Setiing
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The James Boys Were Plain Amateurs!
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It . thf week 1 if Pen^Patience and
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Sweet Ballyhoo and Army Tieup Explo
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. . Joseph . . Texas Fred Stein to
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. . . Louis . . . Lena Paul . . Wal
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. . . The . . Lou . . Alfred . . La
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. . The . . Ray lie : PHILADELPHIA
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Philippines Leading 16mm Film Marke
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: September Cleifers STUDIO PERSONN
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$200,000 Lancaster, Calif., Antelop
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. . Gerry . . The . . SEATTLE XJ H.
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. . Charlotte . . Ron . . Manager .
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^J MILWAUKEE pay Schneider was winn
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. . Eddie . . ST. LOUIS piU Thomas
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. . Remodeling . . James . . Constr
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. . D E S MOINES IWrayo Beatty, for
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. . . Local . . Tom 2nd COLUMBUS pe
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Church and Theatre Live in Harmony
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Dave . . W. CINCINNATI fJTTS. Mary
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. . May Fortune . . John . . RKO Ha
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. . M. . . The are Total of 45,500
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. . Harry . . Sam rMOVIE HOUR W SEA
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Heart Award to Tent 23 In Boston Se
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. . Howie . . Warren . . Harry . .
Page 86 and 87: ..:=«««Wt**l«W^- CLASSIFIED ADS
Page 88 and 89: . . . Frank . . Jack . . Actors . .
Page 90 and 91: . . . Ben . . . Ernest . . Buddy DA
Page 92 and 93: . . Harry . . "So . . . Texas . . M
Page 94 and 95: NY TIME is a GOOD TIME to read and
Page 96 and 97: Consistently . Top . For Give . . .
Page 98 and 99: . . M. . . Leonard . . Johnny . . M
Page 100 and 101: . . H. . . Romeo . . "Hamlet," . .
Page 102: . . Martin . . The . . The . . Mrs.
Page 105 and 106: i A theatre operator's report on BO
Page 107 and 108: HERE'S HOW TO BEAT A FULL HOUSE lou
Page 109 and 110: ' THE STRONG ftfCTR/C CORPORATION A
Page 111 and 112: SEPTEMBER II. 1948 Vol. XV No. 10 o
Page 113 and 114: Fig. 3. Front of the auditorium, sh
Page 115 and 116: suntan Another new lamp is a onc-wa
Page 117 and 118: Booth Firms No. Ace Electric Mfg. C
Page 119 and 120: SLIMLINE FLUORESCENT LAM PS- A New
Page 121 and 122: . . Ballantyne VISIT BOOTHS 70 AND
Page 123 and 124: .MeMM^ ADDED INCOME OPPORTUNITIES F
Page 125 and 126: ' "PAYS FOR ITSELF WHILE IT PAYS YO
Page 127 and 128: I ONLY ^fLLU/LUiîf DELIVERS THE "C
Page 129 and 130: STAND AT DALLAS AIRER IS 'BIG BUSIN
Page 131 and 132: vm Good lighting— a fundamental t
Page 133 and 134: Starxrf the tieater interior In the
Page 135: Prompt Delivery • Choice of World
Page 139 and 140: WHY V^J WAGNER LETTERS and FRAMES A
Page 141 and 142: Tall, slender tapering, esthetic li
Page 143 and 144: Brfgh+en up, EVERYBODY! WH-for the
Page 145 and 146: iiij %mm>N$ No other item of theatr
Page 147 and 148: I y ^^^mêai^. Go down any "Main St
Page 149 and 150: . NEW . TORONTO, ADLER ,.5v^^^^^'''
Page 151 and 152: MEETING THE UNWELCOME GUEST Fire Pr
Page 153 and 154: Hoff. SIX ADDITIONS TO BALLANTYNE L
Page 155 and 156: deg. or more. The lamps are equippe
Page 157 and 158: lence is achieved, througn tne use
Page 159 and 160: pictured here. The attractive young
Page 161 and 162: PERSONNEL QUIZ: Some Timely Tips on
Page 163 and 164: |uee Theatres Redecorated by Eugeni
Page 165 and 166: w . . . brochure . . brochure . . c
Page 167 and 168: f Dealer Appointments By General Re
Page 169 and 170: I! )XOFFICE BAROMETER • EXHIBITOR
Page 171 and 172: BOXOFFICE BookinGuide Sept. 11, 194
Page 173 and 174: CHECK RUNNING TIME WITH LOCAL EXCHA
Page 175 and 176: Sf^YOFFirr Ttonlnnniiiria Sent. 11.
Page 177 and 178: ll CHECK RUNNING TIME WITH LOCAL EX
Page 179 and 180: I 1 915 '> An interpretative analys
Page 181 and 182: • 14, ' Mighty , Title bnunib unn
Page 183 and 184: }pMoas on Currtat Productloas; Expl
Page 185: ((rim , lamps, ition I e : Willi .
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