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.RADIO BROADCAST. Table 1 — Tabulation of Parts Made and Purchased by Manufacturers Covered by Survey purchase from outside com- panies the large high-wattage resistors such as the output voltage divider in the plate- supply unit. Many manufac- turers evidently make their own metal cabinets but pur- chase the wooden cabinets. The totals at the bottom of Table I show the number of parts the various com- panies purchase and make. In Table II these totals have been converted into percent- ages. Table II, therefore, shows the percentage of parts purchased and the percent- age of parts made in the case of each manufacturer. From these figures we arrive at the average percentages given at the bottom of Table II. Table III gives the per- Tabk II Manufacturer 2 3 4 5 6 7 8 9 10 11 12 13 14 Aierage PERCENTAGE OF PARTS Bought 45 94 22 37 30 28 40 33 47 S3 29 11 26 33 38 Made 55 6 78 63 70 72 60 67 53 47 71 89 74 67 62 AVERAGE MADE AVERAGE BOUGHT 3 4 12 13 14 5 6 7 8 9 10 MANUFACTURERS The data of Table II in graph form. Black bars indicate percentage of parts bought. centage of manufacturers who either purchase or buy the various parts, indicating thereby which parts are most generally made and which are generally purchased. For example, filter condensers are purchased by 36 per cent., made by 57 per cent., and partially made and partially purchased by 7 per cent. Dials are made by 86 per cent, of the manufacturers, only 7 per cent, purchased all their requirements of this item from the outside, and 7 per cent, make some dials and purchase the remainder of then: requirements. To indicate in numerical order those parts most generally made by manufacturers we (Continued on page 238) Table III Tabk IV PERCENTAGE OF MANUFACTURES WHO Filter Condensers Variable Condensers Ky-pass Condensers A. F. Transformers Power Transformers Filter Choke Coils R. F. Choke Coils R. F. Tuning Coils Fixed Resistances Variable Resistances Tube Sockets Metal Chassis Dials and Assemblies Shields Loud Speakers Tubes Cabinets Purchase the part 36 36 50 14 29 29 7 0 57 64 29 14 7 21 29 86 57 Part R. F. Tuning Coils R. F. Choke Coils Metal Chassis Dials and Assemblies A. F. Transformers Power Transformers Filter Chokes Shields Tube Sockets Loud Speakers Filter Condensers Variable Condensers By-pass Condensers Variable Resistors Fixed Resistors Tubes Cabinets Percentage of Mfrs. who make them 100 93 86 86 86 71 71 71 64 64 57 50 43 36 14 14 14 • AUGUST 1929 205