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Table 2
Equivalents in Terms of Fresnels of Wave-lengths in Millimicrons
Adopted as Standard by the Illuminating Engineering Society and the Optical Society
of America 1919-1920.^[1]

Wave-Lengths	Adopted Mean I. E. S	Absolute Visibility
400	0.0004	0	.27
10	.0012	0	.8
20	.0040	2	.7
30	.0116	7	.72
40	.023	15	.3
450	0.038	25	.3
60	.060	40	.0
70	.091	60	.7
80	.139	92	.6
90	.208	139
500	0.323	216
10	.484	322
20	.670	446
30	.836	587
40	.942	629
550	0.993	662
10	. 996	663
70	.952	641
80	.870	580
90	.757	502
600	0.631	421
10	.503	336
20	.380	253
30	.262	175
40	.170	113
650	0.103	68	.8
60	.059	39	.3
70	.030	20	.0
80	.016	10	.7
90	. 0081	5	.4
700	0.0041	2	.7
10	.0021	1	.4
20	.0010	0	.67
30	.00052	0	.35
40	.00025	0	.17
750	0.00012	0	.08
60	.00006	0	.04
Wave-Length
of maximum	556

1. Cf. Jour. Opt. Soc. of America, 4, p. 58; 1920.