Abstract
This paper dealt with two experiments on static electrification. One is a basic experiment. The relations have been investigated between static electricity and four experimental conditions, such as temperature, relative humidity, frictional speed and frictional pressure. Another is a practical one, in which static electricity has been determined in taking off man's clothes. An apparatus was constructed to control above four experimental conditions. Density of static charge was measured by using a field mill type electrometer.
The experimental results are as follows:
1) The significant difference in generation of static electricity has been recognized in materials, relative humidity, frictional pressure and frictional apeed, but unrecognized in temperature.
2) The regulation of humidity is the most effective to prevent static electricity.
3) Knitted goods generates larger charge density than woven fabrics do in taking off man's clothes.
