814 
exposure and intensity of development is that, where the straight 
part of the blackening-curve is inclined to the absciss-axis in an angle 
6 
8 
5 
000, 10 
— blackenin 
oO 
5 
— faculty of transmission in °/o. Fig 2. 
of 45°. According to fig. 2 this inclination is too small in our blacken- 
ing-curve; so we had to expose the plate a little shorter and to 
develop it for a longer time. 
100% 
4790 Wbp 
4713 
oo 
a 
oO 
i 
6900 
6400 
6190 
5770 
5600 
5460 
5330 
5090 
4980 
—> faculty of transmission. 
$610 
| 5980 
— wavelength Fig. 3. 
