Graticules, Stage Micrometers, and Calibration Standards


Eyepiece Graticules (continued) British Standard Graticule — NG10


In this graticule the circle areas double progressively, hence the diameters alter by Root 2, so that the size classes can form a continuation of the standard series of sieves for particle sizing. Each particle is assigned to a size class defined by two adjacent circles, which represent the size limits of that class. Thus the distribution of size is obtained in terms of the diameter of circles having the same projected area as the particles. This method will cover particles in the range 150 micron to 0.38 micron. The size distributions with respect to their number and weight are determined separately. Final results are calculated as cumulative percents.


Originally designed by the National Coal Board for use in coal mining. Pattern


Description NG10


British Standard (BS3625/BS3260) Globes & Circles.


Surface chrome image Fairs — NG5 Designed to extend the sizing range of globe and circle graticules.


Example: Used in conjunction with NG2 the overall size range = 128:1. The circles increase by 2.


Note: Both graticules would have to be used with the same microscope, eyepiece and objective.. Pattern


Description NG5 Dia.


Fairs. Grid length 4mm. Glass Sandwich. 16mm 19mm 21mm


Cat.#


68033-16 68033-19 68033-21


British Standard Graticule NG10


Dia.


16mm 19mm 21mm


Cat.#


68026-16 68026-19 68026-21


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