On the Photocomparator and the Stereo Pricking Device 
5 
the emulsion layer (but to cause no scratch on its base.) 
( d ) The top and the lowest positions of the pricking needle are adjustable in 
accordance with the thickness of the layer of the material used as the 
diapositive as the case may be where dry plate, or film, or any other 
material is used. 
('e ) An opal glass is prepared in order to receive the light emitted from the 
illuminating light source and obliquely illuminating the emulsion surface 
and to get brilliant field of view in the case of observation. This opal 
glass presents itself steadily direct under the pricking needle during ob 
servation whereas at the moment when the push button is pressed which 
allows the pricking needle to be operated, the opal glass will be turned 
from the position directly under the pricking needle toward outside and 
will come to stop at the position when the pricking needle is not prevented 
to descend. Furthermore, in order to return the opal glass directly under 
the pricking needle after one operation of pricking is over, another but 
ton shall be pressed. 
Photocomparator (ASIA KRC) 
Object 
It is the object of this instrument to measure with high precision the coordi 
nates (X, Y) of the point pricked on the diapositive by means of stereoscopic 
observation by making use of its sister instrument, stereo pricking device (ASIA 
KRP). 
ASIA KRC (Photocomparator)