Colors

Garrison flag, hoisted at military posts from reveille till sunset, is the national color or U. S. Flag. It is made of bunting, 36 ft. fly and 20 ft. hoist, with 13 horizontal stripes of equal breadth, alternately red and white, beginning with the red. In the upper quarter, next the staff, is the Union, composed of a number of white stars, equal to the number of States, on a blue field, one-third the length of the flag, and ex be rapidly rotated by means of a pulley driven by a band from the driving wheel of some motor. Its purpose is to produce a succe ion of color impre ions upon the retina so rapid as to cause the sensation to be that of a single resultant tint. A graduated circle is fixed to the spindle; disks of colored paper slit from the center outward may be placed against the disk, and by the graduations the relative amounts of color exposed may be read off. By this means the effect of the mixture of different colors in different proportions may be studied.