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David Cameron. President Barack Obama and Prime Minister David Cameron of the United Kingdom talk during the G8 Summit at the Lough Erne Resort in Enniskillen, Northern Ireland, June 17, 2013

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Groups of depositors in front of the closed American Union Bank, New York City. April 26, 1932. Great Depression run on bank crowd

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Andrew Jackson delivering a speech while on his way to Washington, D.C., for his inauguration in 1829. From Harper's Weekly, 1881.

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Click on image for enlargements of panel sections. The Ghent Altarpiece (open view) by Jan and Hubert van Eyck, 1432, polyptych with 12 panels, oil on panel; in the Cathedral of Saint-Bavon, Ghent, Belg.

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Jackson (Wyoming, United States). Jackson Lake (also called Jackson Hole), southern end of the Teton Range (the Grand Tetons), Grand Teton National Park, Wyoming, USA

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United States electoral college map showing number of electoral votes by state.

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worm gear

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gear design

In gear
…are usually connected by a worm and gear. The worm resembles a screw, and the gear resembles a quarter section of a long nut that has been bent around a cylinder. The commonest angle between nonparallel shafts, either intersecting or nonintersecting, is a right angle (90°).
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