The influence of the mass of a spring on its static elongations or on the oscillation period, when a mass is suspended at its end, is discussed. It is also demonstrated by theory and experiment that the coefficients 2 or 3 commonly used in the literature are not always correct.
By x-ray diffraction, the chemical formula and crystal structure of Pt30. have been established. The crystal lattice has a body-centered cube symmetry. The edges of the cubes are 6.226A long, and there are two molecules per unit cell. A chemical method for preparing this oxide has been given by Jorgensen but Wohler claims that the compound thus obtained is a mixture of monoxide and dioxide rather than a separate chemical entity, see references 2 and 3.
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