We use Optical Character Recognition (OCR) during our scanning and processing workflow to make the content of each page searchable. You can view the automatically generated text below as well as copy and paste individual pieces of text to quote in your own work.
Text recognition is never 100% accurate. Many parts of the scanned page may not be reflected in the OCR text output, including: images, page layout, certain fonts or handwriting.
232
The Kinematograph Year Book.
Table of Wire Fuses.
Approximate
Approximate Standard Wire G
AUGE.
Fusing Current
in Amps.
Tin. 1 Lead.
Copper.
5
85
23
38
10
21
20
33
'5
19
18
30
20
17
i;
28
25
16
15
26
30
15
14
25
35
14
13
24
40
14
13
23
♦5
13
12
23
50
13
12
21
5o
12
31
70
20
80
Strip fuses above
Strip fuses above
19
90
this gauge.
this gauge.
18
too
18
120
17
Note.— The full normal load on a fuse should be two-thirds of its fusing load. For projector arcs, however, it is wise to allow a margin of 50 per cent., or double the current between fuU and using 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 ia Amps.
Top and Bottom Carbons.both cored
10.15 15-25
25.40
3550 40.60
60. IOC
10 mm.
12 ,,
13 ..
14 .. 16 „ 18 ,.
13 mm. 16 „ 18 „ 20 ,, 22 ,, 25 ..
1
15-25 20.35 30.40
3550 45-65 60.80 75.100
10 mm.
13 ., 16 „ 18 „ 20 ,, 22 „ 25 ..
Reflecting Power of Various Materials.
Material Percentage of Reflection
Highly polished silver 92%
Highly polished brass 70-75%
Highly polished copper 60%
Ordinary mirrors 5°% (about)
White paper 82% ■
Aluminium reflecting cloth 90%
Yellow painted wall 4°%
Light green paper 20%
Dark brown paper ^3%
Red-blue and green paper 11%
Dull black paper 5%
Black cloth i %
Black velvet 230%
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 table on page 230 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.