138 Measurements of Rulings on Glass. By E. W. Morley. 
Upper Curve: Upper Curve: Lower Curve: Lower Curve: 
Abscisse. Ordinates. Abscisse. Ordinates. 
Millim. Millim. | Millim. Millim. 
0 — 4:2 0 + 0:8 
5 + 5:1 6 +08 
10 + 2:4 | 12 — 12 
15 — 6°7 18 + 1:4 
20 — 1:0 24 — 14 
25 — 0°3 30 + 0°2 
30 + 8°6 36 — 0°2 
35 + 0°8 | 42 a 
40 - 6:1 | 48 — 07 
473 — 78 | 54 + 2°0 
523 413 | 60 ah, 
574 + 3°6 66 — 0°3 
623 — 5°8 72 — 1-2 
673 — 4:2 78 + 0'7 
764 + 4:1 84 — 1:7 
814 + 5:1 90 + 1:4 
864 + 0:5 96 — 07 
912 — 4:7 102 + 0:2 
964 + 1:2 
1014 + 5:8 | 
1062 + 5°4 | 
1112 + 0:3 | 
1164 — 4:1 
Horizontal scale, 10 millim. = ;}, inch. 
Vertical scale, 10 millim. = z5355 inch. 
