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0023139
LEONARDO DA VINCI.
Study of friction on flat as well as mobile surfaces.
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0186403
MARS: SOJOURNER, 1997.
The Sojourner rover approaching the rock Yogi while exploring the surface of Mars during the Mars Pathfinder mission, July 1997. Its front wheels are raised off the ground as a result of friction on the rear wheels.
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0266683
FIRE ESCAPE, 1884.
A woman escaping from a burning building using a 'portable friction' fire escape. American invention, 1884. Engraving, English, 1885.