Motion Picture News (Aug-Oct 1920)

tipment Service) Motion P ic t u r < Mercury arc rectifier installed in one corner of a projection room (Continued from page 2954) Fig. 3, and increases to its maximum positive value at b and falls back to zero at c the flow Wen reverses and the value increases to a maximum negative value at d and returns to ero again at e. The current flow with regard o direction is opposite in X and Y so that vhile X is positive Y is negative and while Y is positive X is negative. We will now follow the flow of current in line X, Figure 1 and compare it to the wave form of Figure 3. The value of the current at A shown by Figure 3 increases positively and since because of the high resistance it cannot pass to electrode B it therefore passes to mercury electrode C and thence t^m the arc to the center of tke reactance and to the line thus completing Jhe circuit. All this takes ,:oe while *be current passes from a to c of xMgure 3. (This article will be concluded in the next issue) Wants More Light on } Screen F. V. H., Texas : I am using alternation current. My throw is 82 feet with a 10 x 13 screen, but I am not getting a good light on the screen. I have two Ft. Wayne Compensarcs and want your opinions on connecting them up so as to get best results. I am using two Motiograph machines. Where can I buy a Crystal Bead screen? And are they a good screen. I am now using a gold fibre screen but it is getting awfully dirty. Reply. Sometimes the Eidtors are of a mind to disregard questions which supply so little information as the one above. With only the facts given by F. V. H. to work on, our best efforts are hardly more than guesses. How do we know what amperage he is using? And»how about the carbon sizes? Perhaps he is using the wrong carbon combination which produces a light source of low unit intensity. And perhaps—several other possibilities. All we can say is this. If he is at present getting the maximum current from his Compensarc, providing he has one Compensarc on each machine, and providing that he is getting maximum illumination efficiency for this value of current, his only hope lies in paralleling his .Compensarcs. This would make it necessary for him to "steal" his arc at changeover periods which is not to be recommended in present day practice. The Bead Screen is made and sold by the Argus Enterprises, Cleveland, Ohio. It is an excellent screen when used on straight-away (or approximately so) projection. When writing to the manufacturers be sure to mention the angle of your projection. zvhere the real work is carried on Projectionist Invents Dissolver Mr. Alfred Werhan, a frequent contributor to the Projection Department, has recently applied for a patent on a new method of dissolving lantern slides. Mr. Werhan is an experienced projectionist and is connected with the Victor theatre at Akron, Ohio, as Chief of Projection. He is a member of Local 864, IA.T.S.E. e Cc CcC Co,e Re'Ul PROGRAMS Society of Motion t Engineers Gonveo Engineers' Club, Daytothi October 11, 12, 13 an A. M. Monday, October 11, 1920. 10:00-10:30 — Opening Exercises and Ac of come by Mayor Switzer. 10:30-10:45 — President's Address, 10:45-11:00 — Reading of Minutes of Las) in 11:00-11:10 — Unfinished Business. 11:10-11:30 — New Business. 11:30-12:30 — Election of Officers. P. M. 12:30-2 :00 — LUNCH. 2:00-3:00 — Paper and Discussion, "Hi Motion Picture," by C. F 3:00-3:15 — Paper and Discussion, " M' Cameras," by Carl L. Gre 3:15-3:30 — Report and Discussion, C] Cameras. 3:30-4:00 — Report and Discussion, Membership. 4:00-4:10 — Report and Discussion, Progress. 4:10-4:30 — Report and Discussion, Advertising. 4:30-5:30 — Paper and Discussion, ' Hazards in Film Exchange sr Blair. 5:30-5:45 — Report and Discussion, Safety 0 5:45-6:15 — Illustrated Paper and Discussio mated Cartoons," by J. R. Br; 6:15 — Dinner at the Engineers' Club by C. F. Kettering. A. M. Tuesday. October 12, 1920. 10:00-11:30 — Paper and Discussion, " Charact Mo.tion Picture Screens," b Jones. 11:30-11:40 — Report and Discussion, Studi mittee. 11:40-11:50 — Report and Discussion, Electrica Committee. 11 :50-11:55 — Report and Discussion, Comm Publications. 11:55-12:05 — Report and Discussion, Papers C( 12:05-12:10 — Report and Discussion, Auditii mittee. 12:10-12:25 — Report and Discussion, Nom Committee. 12:25-1 :00 — Report and Discussion, Sustainir. bership Committee. P. M. 1 :00 — Luncheon at Delco-Light Compa tory. — Trip through Delco-Light Cc factory and Engineering Depart — Trip through Delco-Light factoi 6:00 — Dinner at Engineers' Club. 8:00 — Theatre Party, Victory Theatre. A. M. Wednesday, October 13, 1920. 10:00-11:00 — Demonstration and Discussion, Taking and Developing of M'tures," machine using paper F. W. Hockstetter. 11 :00-11:30 — Paper, Demonstration and Dis " The High Power Arc in the Automatic Projector," by P. R. 11:30-11:45 — Demonstration and Discussion, of Compensating for Squirming ment in the MAZDA Motion Lamps," by C. A. B. Halvorsor 11 :45-12:45 — Report, Demonstration and Dis Optics Committee, on the " E Color on Motion Pictures." 12:45 1:15 — Demonstration and Discussion of Films made by a New Proc, Wm. V. D. Kelley. 1:15 — Lunch at National Cash Register tory. 2 :00 — Factory Trip. 3:00 — Inspection of Slide and Projectior partment. 8:00 — Banquet at Engineers' Club. A. M. Thursday, October 14, 1920. 10:00-10:10— Report and Discussion of Educ? Committee. 10:10-10:50 — Report and Discussion, Committ Correspondence Course. 10:50-11:35 — Paper and Discussion, "Portable ating Equipment," by H. F. O'Bi 11:35-12:45 — Paper and Discussion, "Power Plai Electrical Distribution Equipmi New Eastern Studios and Labor of the Famous Players-Lasky an. Film Corporations," by J. R. ) heimer. P. M. 12:45— LUNCH. 2:00 — Cars to Miami Conservancy Sites and Cook Field NOTE: We will strictly adhere to the rule prever any interruption to the speaker during reading of a paper. All discussions and c tions will be held over until the end of paper. We will adhere as strictly as possible to definite time schedule given above, and discussions will be limited to four minut each. If this time is not sufficient, the r< mainder should be submitted in writing to th Committee on Papers in order to be printe in the Transactions of the Society. i