Equipment and Methods for Measurements of Soil Temperature (Classic Reprint) - Softcover

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Excerpt from Equipment and Methods for Measurements of Soil Temperature

The bimetal dial thermometersfi/ have a coil-within-coil structure about 1 inches long located in the end of a hollow stem. Changes in temperature cause a rotary action of the bimetal helix; this turns a shaft on which a pointer is mounted. The instruments used in this study employed three indicators. One indicated the current temperature, a second the maximum temperature, and a third the minimum temperature. The thermometers can be purchased with different stem lengths for different soil depths. Van Bavel and Forrest (5) concluded that these thermometers were accurate to less than 1° F., were easy to read, and could withstand normal field exposure.

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