Document J3wVq41Ea5XkKBNrNLEQJQjzO
'&St&
followed, with measurements being made at right, angles to the longest diameters.
T1BLE III--EXAMPLE OP METHOD ISED IX THE CALCULATION OP AVERAGE LOSGITCDIXAL DIAMETER
Meeoiflcatton--2000 135 Fields
Magnification--10,000 113 Fields
mni.
u
I 1 It 11 It X u
mm.
u
t Ixu
10 5.0
12 6.0
13 6.5
It 7.0
13 7.5
16 8.0
17 8.5
ie 8.0
20 10.0
21 10.5
2* 11.0
23 11.5
24 12.0
23 12.5
27 13.5
28 14.0
28 14.5
30 15.0
32 16.0
38 17.5
36 18.0
37 18.5
38 19.0
38 10.6
40 42
a20..o0
43 21.5
45 32.5
47 SO
2a3..o5
S3 27.5
60 30.0
<3 31 5
65 32.3
67 33.5
70 35.0
78 36.5
73 37.5
80 40.0
85 42.5
83 47.5
100 50.0
110 55.0
120 60.0
130 66.0
140 70.0
180 60.0
170 8S.0
178 87.5
180 80.0
2a0o0
100.0 106.0
230 115.0
240 120.0
266 132.5
830 165.0 ;
370 185.0 >
Total
21 7 3 4
12 1 1
8 8 1 3 *>
T
16 1 1 1 8 1 8 1 1 2 2
13 1 1 3 1 4 6 6 1 5 1 A 1 2 2 2
i
'l 4 l 1 o
3 1 1 1 1 1 l 3 i
i
t
200
0.69615 .23206 .08845 .13260 .38780 .00315 .03315 .28620 .28805 .03315 .09845 .06630 .03315 .33010 .03315 .03315 .03318 .36520 .03315
.03315 .03315 .06630 .06630 .43006 .03315 .08315 .08046 .03316 .13280 .16578 .66620 .03318 .16878 .68318 .18880 .83318 .06630 .06630 .06630 .033)5 .08815 .13260 .03315 .13280 .06630 .09045 .03315 .03315 .03315 .03315 .03315 .03315 .00945 .03315 .03316 .03315
6.630CO
3.48075
1.38230 0.84642 0.82820 2.88350 0.26820
0.23178 2.38680
2.88350 0.34807 1.08396 0.76245 0.39780 6.57000
0.44783 0.46410 0.46067 3.97800 0.53040 5.mi2
0.59670 0.6139 1.25970
1.29285 8.81800 0.60616 0.71272 2.23783
0s..7a7s8o0o3
4.8581! 9.15800 1.04423 5.38883 1.1108! 6.0050
1.208917 2.4S62S 2.6S20C 2.81775 1.57462 1.65780
7.9300 1.98000 8.61000 4.64100 7.96600 2.81775 2.90063 2.97860 3.31500 3.48025 3.81238 11.93400
4.39237
6.46875 6.1329
174.11063
3 4 3 6 7 3 9 10 17 13 15 .
J
27 : 25 ! 30 i 35 ; 40 45 !
0.3
0.4 0.5 0.6
0.7 0.8 0.9 1.0
1.2 1.3 1.5 2.0 2.3 2.3
3.0 3.3 4.0 . 4.5
Torsi
37 37 38
4 4
to . 1i 23
4> l n{ 12 I
o
' 4
1j
1'
1
yo !
i.n l.4 1.90 0.42 0.14 >.00 0.90 2.30 4.SO
i.:$n
1.1*3
24.00 4.rv> 5.00 21.00 14.00 4.00 4.3>
101.00
mm. s Length of linage In millimeters,
u = Length o! particle In microns.
( a Frequency 112 X 2
m'
135 Z (5)* Z ff xu) + zdtxm
Average Diameter -------------------------------St +- Zti
a. 1.33 microns.
Results--Particle size determinations were made on samples of the dust collected at various stages in the process of manufacture but no appreciable variation was found. However, there was a marked difference in the average particle diameter of the dust from the two general grades of asbestos fiber. The calculated longi-
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