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- Spherometer abstract "A spherometer is an instrument for the precise measurement of the radius of a sphere. Originally, these instruments were primarily used by opticians to measure the curvature of the surface of a lens.The usual form consists of a fine screw moving in a nut carried on the centre of a small three-legged table or frame; the feet forming the vertices of an equilateral triangle. The lower end of the screw and those of the table legs are finely tapered and terminate in hemispheres, so that each rests on a point. If the screw has two turns of the thread to the millimetre the head is usually divided into 50 equal parts, so that differences of 0.01 millimetre may be measured without using a vernier. A lens, however, may be fitted, in order to magnify the scale divisions. A vertical scale fastened to the table indicates the number of whole turns of the screw and serves as an index for reading the divisions on the head.A contact-lever, delicate level or electric contact arrangement may be attached to the spherometer in order to indicate the moment of touching more precisely than is possible by the sense of touch. To measure the radius of a sphere—e.g. the curvature of a lens—the spherometer is levelled and read, then placed on the sphere, adjusted until the four points exert equal pressure, and read again. The difference gives the thickness of that portion of the sphere cut off by a plane passing through the three feet.".
- Spherometer thumbnail Spherometer.jpg?width=300.
- Spherometer wikiPageExternalLink khan_s_1.
- Spherometer wikiPageExternalLink 1311.3602.
- Spherometer wikiPageExternalLink 1.3517029.
- Spherometer wikiPageExternalLink bulleting_january_2009.pdf.
- Spherometer wikiPageExternalLink buletin_june_2013.pdf.
- Spherometer wikiPageExternalLink S.A.Khan.5.
- Spherometer wikiPageExternalLink citations?user=hZvL5eYAAAAJ&hl.
- Spherometer wikiPageID "2551406".
- Spherometer wikiPageRevisionID "582043283".
- Spherometer hasPhotoCollection Spherometer.
- Spherometer subject Category:Dimensional_instruments.
- Spherometer subject Category:Optics.
- Spherometer comment "A spherometer is an instrument for the precise measurement of the radius of a sphere. Originally, these instruments were primarily used by opticians to measure the curvature of the surface of a lens.The usual form consists of a fine screw moving in a nut carried on the centre of a small three-legged table or frame; the feet forming the vertices of an equilateral triangle.".
- Spherometer label "Esferómetro".
- Spherometer label "Ringsphärometer".
- Spherometer label "Sferometer".
- Spherometer label "Sferometr".
- Spherometer label "Sferometro".
- Spherometer label "Spherometer".
- Spherometer label "مقياس التكور".
- Spherometer label "球徑計".
- Spherometer sameAs Ringsphärometer.
- Spherometer sameAs Esferómetro.
- Spherometer sameAs Esferometro.
- Spherometer sameAs Sferometro.
- Spherometer sameAs Sferometer.
- Spherometer sameAs Sferometr.
- Spherometer sameAs m.07mjss.
- Spherometer sameAs Q2154082.
- Spherometer sameAs Q2154082.
- Spherometer wasDerivedFrom Spherometer?oldid=582043283.
- Spherometer depiction Spherometer.jpg.
- Spherometer isPrimaryTopicOf Spherometer.
