Analogue method for computing the number of spins contributing to a magnetic resonance absorption

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Abstract
An analogue method is described by which the number of spins contributing to a magnetic resonance absorption line may be computed from a recorder tracing of the derivative of the line. Since the area under an absorption profile is proportional to the first moment of the algebraic area under its derivative, it may be determined by a simple balance and cardboard cut-outs of the tracing.