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.