From Celerifere to Tricycle: Using National Board for Professional Teaching Standards as a Tool to Steer Agricultural Education

摘要

In the late 1600s, a Frenchman invented the celerifere, consisting of a timber beam to which two in-line wheels were attached. This primitive bicycle did not have handlebars or a comfortable seat. The rider's feet pushing the wheels were the only ener gy source for momentum and steering. During 1865, pedals were applied to the front wheel of the two-wheeled velocipede. Five years later, the first chain-driven "bicycle" appeared with extra large wheels as manufacturers recognized that one rotation of t he pedals resulted in extra distances. However, the rider sat high above the center of gravity and one quick stop of the front wheel caused the entire bicycle to rotate forward and flip the rider. While bicycle riders were risking broken necks, distingui shed ladies and gentlemen took a spin on an adult "tricycle" without concern for injury since their weight was evenly balanced.