“…However, differences between the real value of the particle diameter and the nominal one have been reported by several authors (Davidson and Collins, 1969;Heard et al, 1970;Phillips et al, 1970;Stober and Flachsbart, 1971;Megaw and Wells, 1972;Porstendorfer and Heyder, 1972;Porstendorfer, 1973;Robillard and Patitsas, 1973;Davidson and Haller, 1974;Heyder and Porstendorfer, 1974;Bierhuizen and Ferron, 1975;Rowell et al, 1979). For example, Porstendorfer and Heyder (1972) made electron microscopic measurements of the size distribution of latex particles after ascertaining the effects on the measured value of shadowing, electron bombardment, cooling of the surroundings of the particles, and so on.…”