单词	spherometer
释义	spherometer An instrument for measuring the curvature of a surface. The usual instrument for this purpose consists of a tripod, the pointed legs of which rest on the spherical surface at the corners of an equilateral triangle. In the centre of this triangle is a fourth point, the height of which is adjusted by means of a micrometer screw (see illustration). If the distance between each leg and the axis through the micrometer screw is l, and the height of the micrometer point above (or below) a flat surface is x, the radius (r) of the sphere is given by r = (l2 + x2)/2x . Spherometer
随便看	universal motor universality universe unstable equilibrium upper atmosphere upthrust uranium uranium series uranium-lead dating URL UV vacancy vacuum vacuum pump vacuum state vacuum tube valence band valence electron valency valve Van Allen belts Van de Graaff accelerator Van de Graaff generator van der Waals' equation van der Waals' force

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