| Show the tenth of a second it Is not common to flud find a person who can correctly estimate the lapse vf st a single secund but in these days of speeding automobiles the exact time when each of two colliding vehicles must have occupied particular spots may be a matter of great importance in a recent experiment a car took nearly two seconds to stop after afler brakes were applied and in that thile it moved niti nineteen eteen feet so even fractions of a second are important one can train himself to estimate even evell tenths of a second try it with vath a watch and it will be found that it Is just possible to count ten in the lapse of a single second out but one must count very fast to do it scientific american |
