Early models of the physics of these devices were created by Carvallo and Whipple.
Early models of the physics of these devices were created by Carvallo and Whipple. In 2011, Koijman et  al. created a modification of this device that worked despite counteracting the forces that are conventionally  thought to allow this device to work. Artist Eric Staller invented a "conference" version of this machine that  gained momentary fame when Google bought some. One part of these machines comes in a Shimano designed  SPD form that is clipless. Bowden cables were originally created for use in these machines and still are today. One  early version of this device popular in the 1810's was Baron Karl Drais von Sauerbronn 's Draisine. Makers of these  include Cannondale and Schwinn. These machines can be equipped with Derailleur gears and chainguards. For 10  points, name these machines that people move by pedaling.
Early models of the physics of these devices were created by Carvallo and Whipple.
bicycle [or bike; prompt on ve  locipede ]