There is quite a bit of descriptive discussion about bubblers (including a 
description of the TGP bubbler and illustrative diagrams of three others) on 
the ASM web site at

For a photo and diagram of the Terpstra bubbler, click on

For a diagram of the Roth model, click on

For a diagram of the Korotev model, click on

I have a photo of the TGP bubbler somewhere in my computer, but I don't 
remember the file name and cannot find it. All that you see is a brownish 
boulder with a flat but somewhat concave surface. Evidently, water from a 
city water pipe goes directly to the boulder and pours onto the surface, 
puddling in the concave area and spilling out over the sides.

Bob Fisher
Independence, Missouri
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The Audubon Society of Missouri's Wild Bird Discussion Forum
ASM Website: