Production of theJoshi-effect in the aerial current under electrical discharge in chlorine

Summary

Arising out of Joshi’s observation of the dependance of theJoshi-effect −Δi on circuital parameters and especially the author’s earlier work on Δi under uni- and bi-electrode excitation has been the finding that in anisolated sample of purified chlorine (300 mm.) excited by an ozoniser discharge due to 4–10 kV of 50 cycle frequency the negativeJoshi-effect %Δi=100×Δi/i _D, detected with an aerial increased from 5–90% current diminution in but ordinary light, as its capacity was decreased progressively. Introduction of a serial capacitance in the aerial circuit tends to increase (numerically) the netJoshi-effect −Δi; that of a by-pass capacity decreases it. These results are in accord with Joshi’s view that H.F.’s constitute the seat of −Δi. A large (48%) and reproduciblead libitum positiveJoshi-effect, i.e., an increase +Δi of the discharge current under light, occurs in the L.T. line, especially under H.F. rejection, it is suggested that the positive effect may be associated with thelow frequencies of the discharge current.