Motography (Jan-Jun 1918)

February 23, 1918. MOTOGRAPHY 379 Solution of Projection Problems HOW TO OBTAIN THE BEST RESULTS DESCRIBED IN DETAIL Projection by Mazda Lamps Practical Gives Soft and Pleasing Picture, Eliminating Flicker of the Arc, and There Never Is Any Carbon Dust EVIDENTLY THE OLD CARBON ARC, for all the service it has rendered for lo, these many years, is in disfavor. It is merely tolerated for want of a superior substitute. That is demonstrated by the extraordinary interest Argus direct current regulator. manifested by exhibitors in the article, published January 19, on "Mazda Lamps for Motion Picture Projection." It is plain to see that the idea of discarding the open carbon flame and using in its place the familiar glass bulb is highly popular. For everybody knows that the modern incandescent lamp, with its total absence of bad habits, is well-night perfect. Therefore we hasten to assure our thousands of inquiring readers that projection by Mazda lamps is a reality — a practical procedure ready to be adopted by all enterprising exhibitors. Just as a reminder of the benefits they will gain by installing Mazda outfits, we present here, at the risk of repeating ourselves, a few of the advantages. The quality of light from a Mazda lamp is one important feature that might not occur to the theater man who thought only of escaping from the troubles of the arc. Mazda light approaches the ideal in tone and color. It gives a soft and pleasing picture on the screen. It contributes to its pictures a greater depth than is possible with the arc, with a notable absence of harshness. It eliminates the annoying flicker of the arc — which is always blamed on the picture itself by unthinking persons. The so-called "arc travel" familiar to alternating current users is, of course, wholly absent; and so the light on the screen is always even and uniform. The hiss and hum of the arc is gone, too. There is no carbon dust from the Mazda lamp. That saves not only the fine mechanism of the projecting machine, but the tissues of the operator's lungs and throat. The operator also escapes the carbon monoxide gas generated by the carbon arc. There is no "feeding" to be done, no adjustments to make; and that alone makes for better projection, because it gives the operator time for a higher class of work. There is a considerable direct saving by the use of Mazda projection, since the arc uses 2,000 to 4,000 watts, against a maximum of 1,200 for the Mazda. This difference is net on alternating current, using a regulator. It is somewhat less on direct current, using the d. c. regulators, but still well worth while. It is announced by the Argus Lamp and Appliance Company, of Cleveland, Ohio, that the Sheck universal adapter, when properly installed, will adapt any make of carbon-arc motion picture projection machine to use any type of Mazda projector lamp on the market. This adapter is a complete lamp house in itself and fits on the front of any existing make of carbon-arc machine so that any type of Mazda projector lamp may be properly focused in it for suc cessfully projecting motion pictures in place of the carbon arc, within the limitations of the different types of Mazda projector lamps. At the present time there are three models, and other models will be announced as the Mazda lamp manufacturers announce other types of Mazda projector lamps. The Model "A" Sheck universal adap Extcrior view of all models of the' Sheck universal adapter. Argus alternating current regulator. ter is designed only for the proper operation of the 20-ampere, 28-30-volt 600watt Mazda projector lamp in the T-20 bulb. This type of lamp is supplied by all the different lamp manufacturers or their agents. The Model "B" Sheck universal adapter is designed for the operation of the 30-ampere, 25-volt, 750-watt Mazda lamp supplied by the Mazda lamp manufacturers or their agents. The Model "C" Sheck universal adapter is designed for the operation of the 30-ampere, 40-volt, 1200-watt Mazda projector lamp supplied at present by only one Mazda lamp manufacturer. Existing compensarcs, transformers, rheostats and economizers used for the operation of present carbon-arc equipment, will not do for the correct operation of Mazda projector lamps for motion picture projection. Argus Current Regulators for the proper operation of Mazda projector lamps have been designed under the supervision and approval of the Mazda lamp engineers. It is important not to attempt to op