Page:Popular Science Monthly Volume 92.djvu/193

 Into the Air to Warn London of Air Raids

��Putting the bomb, or rocket in the mortar. As is evident, the mechan- ism for firing is simple. It can quickly be mounted on the top of a wall or on a convenient roof

��Fire! The operator simply pulls a lanyard attached to the fuse and away goes the bomb high over the city. When many bombs are ex- ploding the noise is deafening

���Cleaning out the mortar after firing. Since the mortar is short, this is not difficult. Lon- don plans to have smoke bombs for use during the day, so that smoke clouds as well as loud detonations may warn the people

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