SCIENCE PHOTO LIBRARY SCIENCE PHOTO LIBRARY
Time zones wheel. This device is designed to show the exact variation in time between different cities on the Earth. The cities are marked on the inner rim, with Roman numerals showing a 24-hour clock, and the 360 degrees of a circle on the outer rim. It invented by a Frenchman named Mathieu-Martain. Artwork from the ninth volume (first period of 1892) of the French popular science weekly 'La Science Illustree'.
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