Note on added mass and drift

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Abstract
Several points of interpretation are reviewed bearing on the celebrated discovery by Darwin (1953) that the added mass for a body translating uniformly in an infinite expanse of perfect fluid equals the drift-volume times the density of the fluid. The discussion focuses on the delicate qualifications needed to secure this equality as a mathematical proposition. In § 2 a different approach to the matter is presented, leading to a new fact about added mass. In § 3 a model of infinity in the fluid is proposed which clarifies an aspect of Darwin's original analysis.

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