Abstract
The charge of tobacco or mosquito incense aerosol which was charged by corona discharging device or by illumination with ultra violet ray was measured by a chage spectrometer. The corona discharging was positlve corona. Measurements were performed by reading the deffection of aerosol beam under various electric fields in the charge spectrometer. The mechanism of charging of aerosol in the corona discharging process was discussed and the equation for estimating charge of aerosol which entered to the charge spectrometer through corona discharglng tube was derived. The charge calculated from the above equation was compared with the charge obtained by using all equations of Lipscomb, Cornish, Bonsinesq, and the authors. It was found that the tobacoo aerosol was initially negative but it changed to prsitive in passing through the positive corona field or by illuminated with ultra violet ray. The charge of mosqite incense aerosol was also positlve in passing through the positive corona field. The results of size measurement of these aerosol by charge spectrometer was not agreed with that obtained by a ultramicrosopic method. The formner was larger than the latter.
