The book Practical Optics for the Laboratory And Workshop was written by author B K Benjamin King Johnson Here you can read free online of Practical Optics for the Laboratory And Workshop book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is Practical Optics for the Laboratory And Workshop a good or bad book?
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Fig. 70 shows a three-legged spherometer, and, as will be seen, it consists of a small tripod, in the centre of which is mounted a very finely pitched micrometer screw with ? divided disc attached to it. This divided disc reads L-tennediate values of divisions of the vertical scale T? 81 82 PRACTICAL OPTICS shown in the figure on one of the legs. When using the instrument, it must first be placed on a flat surface (such as an optical " flat "), and the micrometer screw moved Vertical Scale Circ...ular Divided PJate Micrometer Screw V FIG. 70. up or down until all four " feet " are exactly in contact with the surface at the same moment ; the reading on the scale and divided disc should then be taken ; this should be the zero of the instrument. After this, place the in- strument on the surface whose radius is required, and again move the micrometer screw up or down according as the surface is convex or concave and take a second reading. (All readings should be a mean value of a number of settings.
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