Tullgren funnel

Tullgren funnel

a piece of apparatus for extracting animals from soil or litter. The soil litter is supported on a gauze, heated from above by a light bulb, and organisms are collected in a container when they fall through the funnel as they move down the heat/desiccation gradient.
References in periodicals archive ?
A modification is called the Tullgren funnel, which includes a light bulb above the funnel to accelerate the drying of the material and to force the specimens towards the vial at the bottom.
These samples were placed in Tullgren funnels and exposed to a light and heat source for 7 days as outlined by Sutherland (1996) and New (1998).