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	Hoyle, Sir Fred Hubble constant Hubble Space Telescope Hubble, Edwin Powell hue hum humidity Humphreys series Hund coupling cases Hund's rules hunting Huygens' construction Huygens, Christiaan hydraulic press hydraulics hydrodynamics hydroelectric power hydrogen bomb hydrogen electrode hydrogen half cell hydrogen ion hydrogen spectrum hydrometeor hydrometer hydrostatics

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