SECONDARY STANDARDS. 
923 
D. 
C. 
F. 
E. 
10-4 
10-4 
747-8 
11 
10-55 
10-6 
747-7 
11-1 
10-65 
10-7 
747-7 
11-2 
Scale. 
I + Y, G + Q4-4R + X 20-41 
20-36 
19-90 
20-02 
I + Y, G+Q + 3R + X 15-47 
14-56 
14-71 
14-72 
14-24 
15-09 
169-48 
Scale. 
G + a + 4R + X, I + Y 16-90 
16-67 
16-42 
16-79 
G + Q + 3R + X, I + Y 16-36 
16-55 
16-41 
16-05 
15-69 
15-85 
163-69 
20(G + Q + X) + 68R£!:20(I + Y) + 5-79 parts. 
40(G + Q) + 148R£b40I + 9-82 parts, M=10-23, F=747-8, E=ll. 
G + Q£bI-0-04086 grain in air (^=10-23, 5 = 746-91). 
G=I — 0-03932 grain. 
G£I:W— 0-03937 grain in air (log A=: 7-07832 — 10). 
G=lb. No. 25. 
D. 
C. 
F. 
E. 
10-52 
10-55 
768-7 
11-5 
10-85 
10-85 
769-4 
11-65 
11-1 
11-1 
769-7 
11-9 
100 parts= 0-39825 grain. 
Scale. 
I + X, G + Q + 2R + Y 17-65 
17-00 
15-40 
15-61 
17-21 
16-11 
18-01 
17-84 
16-86 
18-62 
170-31 
Sc3>lc 
G + Q + 2R + Y, I + X 16-42 
15-80 
14-55 
13-94 
16-42 
15-86 
18-65 
18-59 
18-07 
18-20 
166-50 
20(G+Q + 2R)ii20(I + X) + 3-81 parts. 
D. 
C. 
F. 
E. 
Scale. 
I + Y, G + a+2R + X 18-35 
18-91 
Scd-ls 
G + Q + 2R + X, I + Y 18-09 
17-57 
11-3 
11-3 
770-2 
11-9 
16-17 
18-04 
18-06 
18-01 
17-82 
17-70 
11-45 
11-45 
770-3 
12 
18-26 
17-37 
17-22 
16-91 
17-70 
17-00 
11-6 
11-6 
770-5 
12-1 
15-77 
14-80 
14-51 
15-64 
172-77 
171-13 
20(G + Q + 2R + X)i:20(I + Y) + 1-64 part. 
40G + Q + 2RA40I+ 5-45 parts, M=ll-13, F=769-8, E=ll-84. 
G + Q— I — 0-02218 grain in air (^=11-14, 5=768-77)- 
G= I + 0-00163 grain. 
G AW — 0-00368 grain in air (log A=7-07832 — 10). 
6 E 
MDCCCLVI. 
