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It would have adjusted the "leakage" of air from the two middle(?) return ports and acted as a relief valve to slow down the "Delta V" or density/velocity of air as it escaped the reg. The control valve definitely looks like a set screw arrangement that could be adjusted for various flow. It would have been adjusted for DV on the surface for a specific interval of time and a specified depth. This was first accomplished through trial and error for the first few dives or so and at shallower depths of so and then the diver would get a "feel" for what setting was good for what time and depth. After all, it is basically a controlled free flow regulator. To answer your question, the out-flow would have come out around the adjustment lever end of the reg. most likely. That being said, the diver would have taken a breath and either breathed out back into the circuit of flow through the use of a one way valve in the mouth piece(very possible due to low pressures of such rigs),exhaled through his nose using an adjustable nose clip, thus turning his nose into a kind of a "Duckbill" if he was wearing goggles, or he had a venting mask of some type and exhaled through his nose normally. This is a mystery.
I still think it might be a constant flow type, or that a ceiling fan mated with a bathroom sink and had a weird kid. 
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