thermo-integrator

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An apparatus, used in studying soil temperatures, for measuring the total supply of heat during a given period.

It consists of a long nickel coil forming a 100-ohm resistance thermometer and a 6-volt battery, the current used being recorded on a galvanometer. The coil is attached to a rod for insertion. A mercury thermometer can be used. The instrument can also measure the heat balance in a plant cover.

Any function of time f(t) is periodic with period t if f(t) = f(t + τ) for all times t, where τ is the smallest number for which this equality holds.

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