More testing...
An HerbalAire vaporizer is required to implement this configuration since a "valve" bottle is connected to the pump fresh air inlet hole (behind). Without it the user needs to prevent flooding his HA oven with moisture by plugging that opening with the tip of a finger, so i prefer the automatic version really...
The red wires on top are there to attach the (soft-drink bottle piece) dome to the reservoir handle which also serves as an anchor point here, rendering the experimenting setup much more stable & reliable.
It's simple to use: inhale moderately to cause some fog to go up the humidifier's internal column, inhale with more force to compensate the weight of water in the valve bottle and cause bubbling. The noise provides feedback while the corresponding turbulence reveals fume-like movements in my (Arizer Solo) glass stem.
The cannabic vapour path is quite straighforward to picture: past my glass accessory there's a set of 3 joined 5/16" I.D. 7/16 " O.D. PVC tubes with the middle one being (pierced under the dome) to let some of the fog in during inhalations while draining excess water out in between. That's a tiny hole equivalent to about 1/16 " (dia.), i used a sliding piece of tubing instead so that i could fine tune this critical factor...
I could as well have just put a single tube passing through the dome via tight-fitting openings, perhaps in a future experiment this is pretty much what i should do though i'd try
more vertical angles to keep condensed water under the dome: water drops at the mouthpiece leaves a bad impression and fog in the HA oven would be even worst... Hence the need for an uni-directional valve mechanism. Ideally the downward curve meant to collect this water should be located as close as possible to the cannabic vapour exit but still within the space under my dome.
Utilisation is simple: inhale weakly to fill the dome with fog, inhale once to fill the path with cannabis vapour and then finish with another faint inhalation to empty the tubing section between the mixing hole (under the dome) and the HA mouthpiece. Thanks to a little fan in the humidifier there's positive pressure preserving the noble molecules located between my vaporizer and that mixing hole: setting the humidifer's knob to its minimum position will turn the fan on while producing fog at a reduced rate.
Aroma & taste appear to benefit from fog conditioning when compared to washing in a regular bong, as for coughing it seems i may have found a potential solution.
Yet this particular concept still needs to be evaluated by others than myself...