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	torus total internal reflection total-radiation pyrometer totality tracing trajectory transactinide element transcendental number transducer transformer transient transistor transition point translation translucent transmission coefficient transmission electron microscope transmittance transmitter transparent transponder transport coefficients transport number transport theory transuranic elements

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