International photographer (Feb-Dec 1929)

Twenty-two The INTERNATIONAL PHOTOGRAPHER December, 1929 (§uper Ma^da Jtamps ■BY ELMER RICHARDSON ELMER RICHARDSON The Mazda Lamp department of the General Electric Company has its principal Lamp Development laboratory located at N e 1 a Park, Cleveland, Ohio. When the representatives of the West Coast Section of the Society of Motion Picture Engineers were en route to the Toronto convention, thev stopped off at Nela Park to inspect some of the recent developments in Mazda Lamps which the General Electric Company has brought forth for motion picture lighting. Their latest development is a 50,000 watt Mazda Lamp, which is the largest experience is acquired, which later is applied to the manufacture of such cars as are sold to the general public. In the manufacture of these powerful globes, many problems have been encountered and solutions worked out which will doubtless be incorporated into the design of lamps not so powerful. The production of the filament for this enormous globe required a special tungsten slug five-eighths inch square in cross section, twenty-four inches in length. Tungsten is one of the hardest of the metals, and the drawing of this slug to the size suitable for the filament required much ingenuity on the part of the engineers of the development laboratory. The stem construction of this lamp embraces an entirely new construction, it being necessary to lead into this lamp a current of 450 amperes in such a way that the vacuum seal of the lamp would not break down. The candle power of these lamps is Mazda Lamp that has ever been constructed. The West Coast representatives to the convention, Mr. Frank E. Graves, chief engineer of the Universal Studios; Peter Mole of the Mole-Richardson, Incorporated; and Fred E. James, sales engineer of the General Electric Company, were present when the first tests were made on these Super-Mazda lamps, and were called into consultation with the engineers of the Development Laboratory regarding the value of such units in motion picture lighting practice. Production of such bulbs probably has a similar relation to the lighting industry, as does the manufacture of racing automobiles to the motor car industry. In the course of developing racing automobiles much valuable knowledge and terrific and can only be measured approximately. The engineers calculate that this lamp produces a light of three million candle power. When one realizes that all this energy is given off from an area of about four square inches you can realize that this lamp produces "some light." It is interesting to note that this development was completed just before the celebration of the Golden Jubilee of Light. In the illustration, there is shown on the table along side of this gigantic bulb a replica of Thomas Edison's first incandescent lamp, a tiny lamp of about eight candle power. The great super-bulb will no doubt find a definite service in either our industry or in the illumination of aeroplane landing fields. The engineers at the Lamp Development Laboratory, Messrs. Ralph E. Farnham, Carl E. Egeler, J. A. Van Horn, and Dan Wright were happy to have the representatives of the Society of Motion Picture Engineers meet with them just at the time when they were completing the development of the 50 K.W. lamp. All of these visitors from the West have been in daily contact with the lighting problems of the studios, and were able to give excellent judgments relative to the value of these superlamps for motion picture work. In the near future, Mole-Richardson expect to have one of the Super-Mazda lamps delivered to them for experimental purposes. Left to right Frank Graves, R. F. Farnham, Carl Eagler, J. A. Fan Horn, Fred E. James, Peter Mole, Dan Wright c THE "INTERNATIONAL PHOTOGRAPHERS" RING This massive hand wrought gentlemen's ring specially designed for I. T. men In Solid Gold 14 Karat $25.00 In Solid Gold 10 Karat 20.00 In Solid Sterling Silver 10.00 With Black Onyx — Hand Hammered — Dre ssy and Durable — Designed and Made by J. A. MEYERS & CO., 822 So. Flower St. LOS ANGELES TTTTTTT] n (, 7 I o n it tt i) B ..llLlllu To get ring size tear off perforated strip and place around finger, bring A toward B, reaching size. Manufacturers of your GOLD LIFE MEMBERSHIP CARDS Designers of the Smith & Aller Trophy, Etc. Mail orders given careful and prompt attention. Kindly send a one-third deposit, ring sent C. O. D. for the balance.