process which yielded a tougher piece of glass not likely to break or become brittle. Marble manufacturing migrated to American shores in the later decades of the 19th century. In 1900 Martin Frederick Christensen received a patent for a machine that made near-perfect sphere
A marble is a small spherical toy often made from glass, clay, steel, plastic or agate.These balls vary in size. Most commonly, they are about 1 cm (1 ⁄ 2 in) in diameter, but they may range from less than 1 mm (1 ⁄ 30 in) to over 8 cm (3 in), while some art glass marbles for display purposes are over 30 cm (12 in) wide.