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Elements of physics (1900)
Henderson, C. Hanford (Charles Hanford), 1861-1941, Woodhull, John F. (John Francis), 1857-1941 · New York, D. Appleton and company · leaf 346
Fig. 220. Fig. 221. A body of clear water, which when calm may revealobjects at great depths, will not do so when the surface is 324 PHYSICSPhysics
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