[Illustration: 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.