then into thin portion 14 c 12 a substantial part of liquid chemical 12 is evaporated from thick portion 14 a and thin portion 14 c ring shaped container 15 accumulates remaining unevaporated excess liquid chemical 12 that drips down from the lower end of thin portion 14 c the feeding and seeping processes keep gauze 14 constantly saturated with liquid chemical when most or all of liquid chemical 12 has been removed in this way container 11 is refilled through intake hole 3 referring to fig2 and 4 a sub vaporizing unit 10 u2032 is located within middle cylinder 5 sub vaporizing unit 10 u2032 has roughly the same configuration as above described vaporizing unit 10 a support 13 u2032 is a cylindrically shaped lattice frame on which a gauze 14 u2032 is mounted and supported gauze 14 u2032 is supported by a top surface and other outer surfaces of support 13 u2032 support 13 u2032 and the lower end of gauze 14 u2032 are mounted on a ring shaped container 15 u2032 liquid chemical 12 that overflows from ring shaped container 15 in vaporizing unit 10 flows down to a top surface of gauze 14 u2032 of sub vaporizing unit.