National Geographic : 1940 Feb
A DEFT MACHINE WINDS GOLF-BALL THREAD OF RUBBER WOUND CENTERS ARE CUPPED INCOVERS Cores (right) are kept in dry ice to prevent melting. Each assembly goesunder pressure of aton toaball. CHILLED BALLS COME FROM THE "CURE" Heat and pressure have united the wound center with the cover. Then the spheres are shrunk with ice water for lifting from the mold. Photographs by B.Anthony Stewart, courtesy Acushnet SIZE IS GAUGED TO AHAIR'S BREADTH In the United States a standard golf ball must notbeless than 1.68 inches in diameter, nor more than 1.62 ounces inweight.