Henderson, C. Hanford (Charles Hanford), 1861-1941, Woodhull, John F. (John Francis), 1857-1941 · New York, D. Appleton and company · leaf 346
in asmall stream into another in the bottle. It is well shownby pouring glycerin into water. Refraction enables us to see the sun two minutes afterit has set and two minutes before it rises, hence it has theeffect of lengthening the day four minutes. Reflection, byproducing twilight, lengthens the…
Physics
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