National Geographic : 1961 May
Outlines of nations may be grease-penciled on the sur face of the transparent Ge ometer-the globe's "think ing cap"-to compare areas, just as this young lady measures the United States against Antarctica. Scales and concentric cir cles embossed on the Geom eter allow computation of distance, direction, and area. Great Circle Ring deter mines time, distance, lati tude, and longitude. When upended, the stand forms a cup for the globe. Free of mounting rods, the ball tilts and rotates to any position. Drawn to a scale of 660 miles to the inch, the ten color globe outlines the bor ders of the world's new est nations. Oceans show soundings, depth contours, and currents. Greeks. Mariners like Columbus and Magel lan in the first great Age of Discovery navi gated with such globes of wood. As centuries passed, most globes became skewered, rig idly inclined at an angle of 23° 27' to show the earth's tilt in relation to the sun. Your Society's globe can easily be set at this angle by touching the dashed lines of the Tropics with the Great Circle Ring. But this is only one feature of your new globe for the modern Age of Discovery. The Geometer solves geographic problems in an instant. On it you can read the azimuth, or bearing, between any two points on earth. Its grid scale gives a quick estimate of sur face areas. Circular scales show the range of intercontinental rockets. Even the stand holding this sphere has special uses. The transparent Great Circle Ring shows instantly the shortest distance along the great-circle course-between any two points on the globe. And the upended stand frees the globe for convenient use of the plastic Geometer, the ingenious thinking cap (above). Whether the child uses this globe by him self or with an adult's help, it is sure to whet his taste for learning. He can take the whole world in his hands and study global geogra phy under the nearest reading lamp. He can visualize his own universe: In the same scale, the moon would be a baseball 30 feet away, and the sun a giant balloon 109 feet in diameter and 21/4 miles distant. Just as children learn from model airplanes and trains, so a model of the earth-a true working model--excites the imagination and spurs a lasting intellectual curiosity. In furtherance of the Society's aims, we offer members this important instrument for the study of geography. Our globe has been proved by the daily work of scientists. I am sure you will share my conviction that it is the most useful globe available today, and another great achievement of our carto graphic staff. SIX-MONTH INDEX AVAILABLE As one of the privileges of membership in the Society, an index for each six-month volume of the NATIONAL GEOGRAPHIC will be mailed upon request to members who bind their issues as works of reference. The index to Volume 118 (July-December, 1960) is now ready.