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CARBONS 345
(39) Proper Carp.ox Combinations*
d.c. stereoPticon, reflector type
15 to 20 amperes, 10 mm positive, 7 mm solid or cored.
21 to 25 amperes, 12 mm cored positive, 8 mm cored negative.
26 to 30 amperes, 13 mm cored positive, 9 mm cored negative.
28 to 32 amperes, 12 mm SRA cored positive, 8 mm SRA cored negative.
32 to 42 amperes, 13 mm SRA cored positive, 8 mm SRA cored negative.
D.C. LOW INTENSITY SPOT AND FLOOD LAMP
30 to 40 amperes, %" positive, either l/2" or 9/16" negative.
40 to 50 amperes, s/g" positive, 5/16" negative.
50 to 55 amperes, Y" positive, H" negative.
55 to 65 amperes, Y" positive, 11/32" negative.
65 to 70 amperes, y%" positive, 11/32" negative.
70 to 85 amperes, ?/&" positive, Y%" negative.
85 to 100 amperes, 1" positive, K" or 7/16" negative.
D.C. HIGH INTENSITY SPOT AND FLOOD LAMP
All carbons arc White Flame positives and Orotip negatives or their equivalents. All carbons are cored.
89 to 95 amperes, 11 mm positive, 11/32" negative. 100 to 110 amperes, 13.6 mm positive, Y," negative. 110 to 125 amperes, 13.6 mm positive, 7/16" negative.
A.C. LOW INTENSITY SPOT AND FLOOD
All carbons both negative and positive are A.C, White Flame or their equivalent and all are cored.
30 to 60 amperes, Y%" positive, ffl negative. 60 to 80 amperes, Ya" positive, Ya" negative.
D.C. REFLECTOR TYPE ARC WITH SOLID NEGATIVE
This is for horizontal trim lamps, cored positive, solid negative. 10 to 15 amperes, 9 mm positive, 6.4 mm negative. 16 to 20 amperes, 10 mm positive, 7 mm negative. 21 to 25 amperes, 12 mm positive, 8 mm solid or cored negative. 26 to 30 amperes, 13 mm positive, 9 mm cored negative. 31 to 35 amperes, 14 mm positive, 10 mm cored negative.
v. IME AS ABOVE, BUT FOR LAMPS IN WHICH THE NEGATIVE CARBON IS AT AN ANGLE TO POSITIVE
6 to 10 amperes, 9 mm positive, 8 mm negative. 11 to 15 amperes, 10 mm positive, 9 mm negative. 16 to 20 amperes, 11 mm positive, 10 mm negative.
*The following carbon sizes and combinations are those officially approved for National carbons. For carbons of other manufacture this information can be secured directly from the distributor.