228 FRIEDLANDER AND PASCERI algebraic expression for the X(r) data of each range and then apply Eq. 6 to obtain n(r) for each range. The two Z(r) curves could then be compared in the overlap region to ascertain the previously mentioned uncertaintres. The 2(r) data for runs 10 and 11 are shown in Figs. 1 to 4. For both runs the Z(r) data obtained at high magnification (smaller size 107 To ww Y eeeed Oo — =_t ee <Zz 10 in! Fig. 1—Cumulative distribution data for run 10. In the very small — 4 «A — particle size range, there is a linear relation between the log of the cu- oO — mutative function and the radius. ] 0 0.01 | | | 0.02 0.03 0.04 0.05 tea ° | 10? F—bain TTT — oO — — oO — vf U ~ re — ao < a. = 10! — WN — _— — | a | O | 1972 — 6 | | it | rp 107! _ _ Fig. 2—Cumulative distribution data for run 11. In the small particle size range, there is a linear yelation between the logof the cumulative function and the radius.