Society of Motion Picture Engineers : incorporation and by-laws (1919)

TABLE 1 No. Class Name Texture Color 1 C ■ Magnesium Carbonate Smooth ■ ■ ■ White 2 C Opal Glass Smooth White 3 C White Blotting Paper Smooth White 4 C Photo Stock Plain Smooth White 5 C Photo Stock Coated Smooth White 6 C White Drawing Paper Smooth White 7 B Sandblasted Aluminum Smooth Metallic White 8 A Sandblasted Mirror Smooth White 9 A Focus Screen and Mirror Smooth White 10 A Superlite Coarse Grain Metallic White 11 A Special Coarse Grain Metallic White 12 B Green Back Fine Grain Metallic White 13 B White Back Fine Grain Metallic White 14 C Plain White Coated Smooth Yellow 15 A Imsco Silver No. 1 Coarse Grain Metallic White 16 A Imsco Gold No. 1 Coarse Grain Metalhc Yellow 17 A Imsco No. 2 Coarse Grain Metallic White 18 A Imsco No. 3 Medium Grain Metallic White 19 B Imsco No. 4 Fine Grain Metallic White 20 C Imsco White Muslin Smooth White 21 A Minusa A Medium Grain Metallic White 22 A Minusa B Coarse Grain Metallic White 23 A Minusa C Coarse Grain Metallic White 24 A Mazda-Lite Fine Grain Metallic White 25 B Idealite-Grade lA Fine Grain Metallic White 26 B Idealite-Grade IB Medium Grain Metallic White 27 B Idealite-Grade 2 Fine Grain Metallic White 28 C Dalite Crystal White Smooth Blue Green 29 Dalite Gold Fibre 30 A Dalite Silver Fine Grain Metallic White 31 A Argus Crystal Bead No. 1 Medium Glass Beads Yellow 32 B Argus Crystal Bead No. 2 Fine Glass Beads Yellow 33 B Mirroroid Fine Grain Metallic White 34 A Gold Ring Smooth Metallic Yellow 35 C Half-tone Smooth White 36 A Aluminium Paper Smooth Metallic White In Table I is given a complete list of the materials measured. The surface of the magnesium carbonate sample (1) was prepared by carefully scraping a block of the material with a steel straight-edge. The opal glass (2) was of the best quality obtainable for uniformity and whiteness, and the surface was carefully ground. The white blotting paper (3) was of the ordinary commercial quality used extensively in photographic work. The photographic stock (4) was a sample of uncalendered and uncoated material. No. 5 was of the same material but treated with the ordinary baryta coating. The drawing paper (6) was the commercial grade of Wattman's hot pressed. Sample No. 7 was prepared by sandblasting a sheet of aluminum. No. 8 was made by sandblasting the front surface of an ordinary plate glass mirror. No. 9 consists of a screen made by superposing a sample of the material such as is commonly used as the focusing screen in photographic apparatus upon the surface of an ordinary plate glass mirror. The commercial screens examined are also listed in Table 1, beginning with sample No. 10. In the name column is given the trade name applied by the manufacturer to the screen. In the ''texture" column is a qualitative statement of the character of the surface, while in the "color" column is a qualitative statement of the color. The terms used in specifying texture and color are very general in nature, no precise quantitative measurements being made of these 67