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U.S. Geological Survey Open-File Report 2005-1001
USGS East-Coast Sediment Analysis: Procedures, Database, and GIS Data
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Constant Temperature Bath

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Image shows overall bath with cylinder being added.
Changes in temperature affect the viscosity of water, and this affects the settling rates of particles in suspension. Therefore, an analyst must maintain a constant known temperature to obtain accurate results during a pipette analysis. The analyst may also find it advantageous to accelerate a pipette analysis by elevating the temperature of the suspension. The most practical way to control the temperature of the suspension during pipette analysis is with a constant temperature bath.
Image shows empty fish tank.
A simple constant temperature bath can be constructed with a 20-gallon fish tank,
Image shows rubber map being added to bottom of fish tank.
a rubber mat to protect the glass bottom of the tank,
Image shows recirculating water heater being attached.
and a recirculating water heater.
Image shows 1-inch plastic balls being added to cover the water surface.
Effective insulating materials include 1-inch plastic balls to cover the water surface
Image shows foam-core plastic board being added to insulate the fish tank walls.
and foam-core plastic boards to insulate the tank walls.
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U.S. Geological Survey
Coastal and Marine Geology Program
Woods Hole Science Center