[LIGHTNING PHOTOGRAPHS.]
FIG. 89.—PHOTOGRAPH OF LIGHTNING MADE AT BLUE HILL.
The method of making photographs of lightning flashes is very simple. The camera is focused for distant objects. During a thunderstorm the camera is pointed in the direction of the flashes, a plate is inserted, the cap is removed from the lens, and as soon as a flash takes place the lens is covered up and the plate is ready for development. To avoid halation a backed or non-halation plate should be used.
[PHOTOGRAPHING FIREWORKS.]
Photographs of pyrotechnical displays can also be made at night. The method of procedure is the same as described for photographs of lightning. The camera is focused for distant objects and the lens pointed towards the place where the discharge takes place. Fig. 90.
[DOUBLES.]
