An unusual map of the northern hemisphere on a polar projection, displaying time zones throughout the world.

The 48 large clocks surrounding the map show the mean solar time for the major cities of the world – such as New York, Peking, and Paris – when the time is noon at Greenwich, while the 36 smaller dials indicate the time for each ten degree of longitude.

The map was published in George Washington Bacon, ‘Universal Atlas of the World’.