Apparatus for Measuring Time Intervals by Using Special Oscillograph

Abstract

Although there are many accurate methods of measuring the time interval, they are not ideal for the use in physical training or physiological observations. Improved chronographical method is described in which the signal is operated by amplified photo-electric current instead of by the customary electro-magnetic or spark device. Graphical studies of the signal are made and a utility model is constructed with which the time interval is measured with the accuracy of 1/100_??_1/200 second.