The Experimental Apparatus for the Demonstration of Science Class Using IC and LED -Large-Scale Stop Watch-

Abstract

Now, we have designed the large-scale stop watch which indicates the time by the digital system, and many students, by the use of this apparatus, can measure the time at the same time in large class room. The present apparatus consists of a large number of IC and LED which are arranged in seven-segment form, and a figure in the digital plate with four figures is 7.8 cm high by 5.2 cm wide in size. The apparatus is able to measure the time for sixty minutes in one second unit, and the oscillating sound from this apparatus is able to sound at intervals of one second or one minute. The management is very simplified and easy as well as the usual stop watch. When this apparatus was employed the demonstration of the period of simple pendulm in the course of physical lecture at our university, this apparatus fascinated many interests and concerns of students. This desirable results wese ascertained from the enquete and the impression on the application of the apparatus.