SUMMARY
The article presents a theory and describes the technique of measuring grain size of fine-grained rocks using the method of photoextinction.· The method consists in measuring the intensity of the light that passes through the suspension of particles in
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fluid, by means of standard colorimeter. Under proper measuring conditions the natural logarithm of intensity of transmitted light is a function of pres.ence of the particles having a determined diameter. Basing on his own experiments and on the existing literature data, the present author discusses all rrierlts and delI).er:"'~ -" n.~ ~",4-'h.vl """",a;.n...,.MPE:UOME
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