- Help for Young Magellans. A variety of inexpensive compasses. The smallest is 1/2" dia x 3/16" thick. The medium is 3/4" dia x 3/8" thick and has glass on both faces, one of which has a reticle on it. The largest of these is 1-3/8" dia x 5/16" thick and has a carrying ring (as drawn). Good for conning a ship in the backyard pool, exploring the park and generally testing the theory that the blue needle always points North.
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