General and practical optics / by Lionel Laurance.

  • Laurance, Lionel.
Date:
1914
Catalogue details

Licence: In copyright

Credit: General and practical optics / by Lionel Laurance. Source: Wellcome Collection.

Provider: This material has been provided by UCL Library Services. The original may be consulted at UCL (University College London)

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    OPTICAL SYMBOLS AND ABBREVIATIONS .S'. or Sph. 0. or Cyl. Pr. Ax. Pc. or Peris. Pcx. or Pcvx. Pec. or Pcvc. Dcx. or Dcvx. Dec. or Dcvc. F. or P.P. F-i and 0. 1. .. Hor. or H. Ver. or V. Mer. Spherical. Cylindrical. Prism. Axis. Periscopic. Periscopic convex. Periscopic concave. Double convex. Double concave. Principal focal distance or focus. Anterior and posterior focal distances or foci. Conjugate focal distances or foci. Object. Image. Horizontal. Vertical. Meridian. D. .. .. Diopter. +, Cx,, or Cvx. Plus, Convex. C'c, or Cvc. Minus, Concave. A PD. .. Prism diopter. V . • • • Centrad. A .. .. Metran. CO .. .. Infinity, a distance in- finitely great. O .. .. Combined with. yti, m., or 11. .. The index of refraction. M., n., or V .. A medium. A or 8 .. The difference between (applied to lines of the spectrum). w or 0).. .. The ratio between the dis- persion and refraction of a medium. V -.. .. The ratio between the re- fraction and dispersion of a medium. MATHEMATICAL SYMBOLS AND ABBREVIATIONS M. cm. mm. Ft. or ' In. or 00 or 1/0 0 or 1/cx. L Metres. Centimetres. Millimetres. Microns. Micromillimetres. Foot. Inch. Line. Degree. Degree of deviation. Minute. Second. Infinity, a number infin- itely great. Zero, a number infinitely small. Angle. Is to, the ratio between. So is, as or equals (used with ratios). Therefore. Because. Varies as, proportional to. Perpendicular to. Parallel to. Right angles to. (Pi) Ratio of circumfer- ence to diameter. T or p r° or p'^ r' or p' r or p d (p + + X </~ x^ X a + h . Radius. . Radius in degrees. . Radius in minutes. . Radius in seconds. . Any angles. . Plus, addition. . Minus, subtraction. . Either -f or -. . Multiplied by. . Divided by. . The difference between. . The square root of. . The cube root of. . The nth root of. . X squared (xx). . X cubed {xxx). . X raised to the power of a number equal to n. . Bond or vinculum. sho\\ ing that the numbers are to be taken together. Is the same as {a + b). . Equal to. . Greater than. . Less than. For ophthalmic abbreviations and symbols, see Visual Optics and Sight-Testing.
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