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2.8
• 39 F
x 208 F
2.4
"
2.0
1
1 1.6
o
u
§ 1.2
0.8
_
11
0.4
\
Fig. 5. Shift in the absorption
U
of a red glass, Corning No.
VS. ,
2408, Melt 1151, with change
00
i
i i i 1 i
, ,
i , i . y *
in temperature.
400
500
600 700
Wave length
(mp)
Table I. Densities of Color-Compensating of the illuminance in the gate, with and
Filters as Measured by
the Densichron without the printer-balancing filters in
Through the Tricolor
Filters Shown. position. A comparison of these six
Density to Kodak Filter
will show whether slow drifts are due to
Designation
No. 29
No. 61
No. 49 lamp or to filter changes.
Special care must be taken if glass fil
GG-05G GG-10G GG-20G
0.06 0.10 0.16
0.04 0.04 0.05
ters are used in the printer, since many of Q'QS them, particularly the reds and yellows,
GG-30G
0.28
0.07
0^06 show a large change in density with
CG-40G CG-50G
0.33 0.43
0.08 0.09
0.06 temperature. This difficulty has been 0 • °6 met with in the use of both Corning No.
GG-05M
0.03
0.06
0.05 2408, Melt 1151, and Corning No. 3384,
GG-10M GG-20M GG-30M
0.03 0.04 0.05
0.10 0.16 0 28
0.06 Melt 600, glasses. The decrease in Q ' JQ transmission of the filter as measured by
GG-40M
0.05
0.31
0 ! 1 2 tne Densichron may amount to 0.25 log /
GG-50M
0.06
0.47
0.13 between room temperature and printer
GC-05Y
0.03
0.03
0.09 operating temperature. Figure 4 shows
GG-10Y
0.03
0.03
0.12 a typical curve of density to red light
GG-20Y CC-30Y GG-40Y
0.03 0.03 0.03
0.03 0.03 0 04
0 • 23 against time for a Bell & Howell printer 0 ' 37 with Corning No. 2408, Melt 1 1 51 , in the
GG-50Y
0.03
0.04
0*44 beam. The equilibrium temperature
C. A. Horton: Color Printing Control
243