Theatre Catalog (1947-48)

The burning life of this 1,100 lumens trim is one hour, ample for the projection of a 2,000-foot, 16-mm. reel at sound speed of 24 frames a second. The trim, currently selling for approximately 25 cents, pulls 1,400 watts from the power line. Ten-hour incandescent lamps that deliver 275 lumens to the screen sell at over 75 cents per hour of life and draw 1,000 watts from the power line. Thus the Pearlex trim can be operated for about one-third the cost of the incandescent lamp while delivering four times as much light. COLOR QUALITY OF LIGHT The operating characteristics of the carbon-are trim for 16-mm. projection are similar in many respects to those of the Suprex carbons widely used for 85-mm. projection, but with certain modifications of color quality.1 In the snow 4*LOZIER, W. W., and D. B. JOY. A carbon are for the projection of 16-mm. film. Jour. Soc. M. P. Eng. 34: 756. 1940. SUGGESTED SEATING PLANS are presented for theatres with capacities of 114 (bottom left), 412 (top left), and 1,016 patrons (right). (reduced in scale) are based on the recommendations that the patrons be seated not closer to the screen than twice the width of the screen nor SEATING PLAN FOR LZ FT. SCREEN, CAPACITY 412 11.3 FOOT SCREEN e w °o © ‘ 2 WJ Ww i o ” °o = nw z Wy as SEATING PLAN FOR 5.7 FT. SCREEN; CAPACITY 114 5.7 FT. 1947-48 THEATRE CATALOG white color of light typical of the highintensity arc, the spectral energy distribution is characterized by an essentially even balance of energy throughout the different colors of the spectrum— which is desirable for the projection of 35-mm. film in color and in black and white. The 16-mm. color film, which is now most widely used, has been processed for projection with incandescent lamps, however, and these lamps differ from the high-intensity arcs in that their light is relatively very low in energy in the blue and very high in energy in the red. As a result, when 16-mm. color film, processed for incandescent lamps, is projected by the snow-white light of the high-intensity arc, the blues are overemphasized and the reds are subdued. The light from the Pearlex carbons has been adjusted to meet the requirements of such film by subduing the blue light and intensifying the red light. This These drawings has resulted in a color of light which is satisfactory for both 16-mm. black-andwhite and color-film projection. Colortemperature of the screen light is approximately 4,450 degrees Kelvin. Data on screen light given throughout this paper are based upon untreated lenses. Carbon arc projection of 16-mm. film with untreated lenses meets recommended standards of projection practice. Use of treated lenses will, of course, still further increase the amount of light on the screen. This might be utilized either to make a given screen brighter or to adequately illuminate a still larger one. Carbon-are projectors are now available from all the larger manufacturers of 16-mm. equipment. They make practical the showing of 16-mm. pictures before a comfortably seated audience of several hundred at light levels conforming to the best standards of projection practice. farther away than six times the width of the screen, and all with a viewing angle of 30 degrees from the vertical plane. are based on the use of 16-mm. high-intensity arc lamps for the 11.3and 17.9-foot screens, and an incandescent lamp for the 5.7-foot screen. These plans SEATING PLAN 179 FT. SCREEN; CAPACITY 1016 FOR 17.9 FOOT | SCREEN 302 LENS TO SCREEN 94 FEET 30 36 FEET 108 FEET 571