SECONDARY STANDARDS. 
921 
D. 
C. 
F. E. 
Scale. 
Scale. 
I + X, G + Q + Y 
18-21 G + Q + Y, I + X 
17-90 
19-07 
17-22 
10-5 
10-5 
751-63 11-4 
18-87 
16-16 
18-09 
15-85 
18-52 
15-96 
10-9 
10-9 
751*33 11*6 
16-75 
14-95 
17-06 
14-10 
16-82 
13-62 
11-05 
11-05 
751-20 11*7 
16-27 
13-50 
16-36 
13-25 
176-02 
152-51 
20(G + Q + Y)£1:20(I + X) + 23-51 parts. 
40(G + Q) 401 + 16R + 20-1 3 parts, M=ll-1, F=751-05, E=ll-76. 
G + Q— 1 + 0-00647 grain in air (<=11-2, b 
=760-07). 
G=I + 0-03971 grain. 
G^ W + O-01779 grain in air (log A = 7*07832 — 10). 
G=lb. No. 22. 
100 parts= 0-38541 grain. 
D. 
C. 
F. 
E. 
Scale. 
Scale. 
I + Y, G + Q+R + X 23-66 G + Q + R + X, I + Y 
24-26 
10-87 
10-87 
756-65 
11-8 
20-81 
22-32 
21-47 
22-30 
20-87 
21-62 
11-35 
11*35 
756-85 
11-8 
19-40 
20-37 
18-45 
20-29 
19-39 
19-45 
11-45 
11-47 
757-30 
11-9 
19-45 
19-62 
18-84 
18-35 
20-21 
18-92 
202-55 
207-50 
20(G + Q+X) + 20Rii20(I + Y)— 4-95 parts. 
D. 
C. 
F. 
E. 
Scale. 
Scale. 
I+X, G + Q + R + Y 17-39 G + Q + R + Y, I + X 
19-59 
18-72 
19-37 
11-55 
11-57 
758-63 
12-1 
17-41 
17-49 
.‘ 16-92 
17-19 
16-65 
16-36 
11-7 
11*7 
758-65 
12-2 
17-96 
16-99 
17-74 
17-82 
18-02 
18-12 
11-85 
11-8 
758-73 
12-3 
17-96 
18-12 
17-52 
17-96 
176-29 
30(G + Q + Y) + 20R£120(I + X) —2-72 parts. 
40(G + Q) + 40R£h40I— 7-67 parts, M = 11'46, F=757-77, E=12-06. 
G + Qiil— 0-01205 grain in air (<=1T47, 6=756-74). 
G=I — 0-01214 grain. 
G^hW— 0-00519 grain in air (log A=7’07832— 10). 
