BOTANICAL PHOTOGRAPHY 



163 



light may shine through it : diffuse daylight is good. Then arrange the 

 camera just as in taking any ordinary picture. The board shown in 



Fig. 30. — Block to press lantern slide plate against the negative 



Figure 31 will be just as useful 

 in making lantern slides as in 

 making photomicrographs. At 

 one end of the board fasten a 

 frame which will hold an 8 X 10 

 negative and also hold kits for 

 smaller negatives (Fig. 315 

 and C). The long slot in the 

 board will allow the camera to 

 be fastened at the proper dis- 

 tance. If buildings, trees, or 

 shadows are in the way, tilt the 

 board so as to have a clear sky 

 for a background. 



Be very careful in focusing; 

 it is best to examine, with a 

 pocket lens, the image on the 

 ground glass. In general, use a 

 rather small stop, F16 is good. 

 If reducing from an average 



A 



Fig. 31. — A, board for photomicrographic and 

 lantern slide work; B, end view with clips to hold 

 negatives; C, side view of block to be used on 

 board when making lantern slides. 



