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Technical Tables. 231
Table of Wire Fuses.
Approximate
Approximate Standard Wire Gauge.
Fusing Current in Amps,
1
Tin.
Lead.
1
Copper.
5
25
23
38
10
21
20
33
15
19
18
30
20
17
17
28
25
16
15
26
30
15
14
25
35
14
13
24
40
14
13
23
45
13
12
22
50
13
12
21
60
12
21
70
20
80
Strip fuses above
Strip fuses above
19
90
this gauge.
this gauge.
18
C DO
18
I20
17
Note.— The full normal load on a fuse should be two-thirds of its fusing load. For projector aros, however, it is wise to allow a margin of 50 per cent., or double the current between full and fusing load. Always use copper wire for arc fuses.
Size of Carbons for Projecting Arcs.
CONTINUOUS. CURRENT.
ALTERNATING CURRENT.
Current in Amps.
Lower Solid Carbon.
Top Carbon Cored.
Current in Amps.
Top and Bottom Carbons, both cored
IO.15
15-25 25.40
35-5° 40.60 60.100
10 mm. *4
16 ,
; 18 „
1
13 mm. 16 „
18 „ 20 „
25 „
15-25 20.35 30.40
35-5C 45-65 60.80 75.IOO
10 mm.
13 „ 16 „ 18 „ 20
22 „ 25
Reflecting Power of Various Materials.
Material Percentage of Reflection
Highly polished silver 92 %
Highly polished brass 7°~75%
Highly polished copper . 60%
Ordinary mirrors 5°% (about)
White paper 82%
Aluminium reflecting cloth 9° %
Yellow painted wall 4°%
Light green paper 20%
Dark brown paper . ... 13%
Red-blue and green paper 11%
Dull black paper 5%
Black .cloth 1 %
Black velvet %
Note on above table. — This gives total proportion of reflected to incident light over all directions. For the motion picture exhibitor it is of greater importance to know the proportion of light reflected from a given surface at some definite reflection angle or angles. The next table gives this reflected light value for various screens at side angles of fifteen degrees, forty-five degrees and sixty degrees, a magnesium oxide screen being taken as the unit for comparison.