GLOBES

Ordinary globes are made _ by pasting sheets of paper over a spherieal core until a sufficient thickne is _ attained. This shell is then cut into hemispheres, removed from the core, and glued together round a metallic axis. It is then covered with a mixture of whiting, boiled oil, and glue, and reduced to a perfect spherical surface by a semicircular are of steel rotated round the poles. A metallic meridian, attached to the poles of the axis and graduated from the equator to the poles, surrounds the globe, and can slide through grooves in a graduated horizontal circle. The first globes constructed were astronomical, the oldest extant being preserved at Naples. The oldest terrestrial globe, showing the knowledge of the world immediately before the voyages of Columbus, was made by Martin Behaim of Nuremberg, 1492; Lenox globe in New York, engraved on copper, is the first