Abstract: Apparatus for generating and dispersing ions, comprises:(a) first and second tip means aimed generally longitudinally forwardly, said first tip means spaced laterally from said second tip means,(b) circuit means to supply high voltage of relatively positive polarity to the first tip means and high voltage of relatively negative polarity to the second tip means, and(c) insulative structure, including a barrier extending generally forwardly to separate positive ions dispensed generally forwardly of the first tip means from negative ions dispensed generally forwardly of the second tip means.The first and second tip means may be located in insulative, parallel tubes which are endwise open and located in the surrounding tube through which gas is caused to flow; or the barrier may comprise a plate or wall which extends forwardly of the tips.

Abstract: Apparatus for generating and dispersing ions, comprises:(a) first and second tip means aimed generally longitudinally forwardly, said first tip means spaced laterally from said second tip means,(b) insulative structure extending about said tip means,(c) and circuit means to supply high voltage of relatively positive polarity to the first tip means and high voltage of relatively negative polarity to the second tip means.The first and second tip means are typically located in insulative, parallel tubes which are endwise open and located in a surrounding tube through which gas is caused to flow.