---------+------------+---------+--------------------------+---------- Scale No.|Wave-length.| Reading.| Colours named by N. W. | Spectrum | | | | colours | | | | to normal | | | | vision. ---------+------------+---------+--------------------------+---------- 60 | 6728 | 3 | Both grey | Red. 58 | 6520 | 10 | „ | 56 | 6330 | 30 | „ | 54 | 6152 | 52 | Colour “brownish,” | | | | white “grey” | 52 | 5996 | 70 | „ „ „ | 50 | 5850 | 81 | „ „ „ | Orange. 48 | 5720 | 87 | Colour “brownish-green.” | | | | white “grey” | 46 | 5596 | 90 | Colour “green,” white | | | | “grey” | 44 | 5481 | 88 | „ „ | 42 | 5373 | 82 | „ „ | 40 | 5270 | 62·5 | „ „ | Green. 38 | 5172 | 46 | „ „ | 35 | 5042 | 23 | „ „ | 32 | 4924 | 12·5 | „ „ | 31 | 4886 | 10 | Colour “brownish-grey,” | | | | white “brownish-green.” | 30·5 | 4862 | 8·5 | „ „ „ | Blue. 25 | 4675 | 5 | „ „ „ | 20 | 4518 | 3 | „ „ „ | 15 | 4376 | 2·5 | „ „ „ | 10 | 4248 | 1·5 | „ „ „ | Violet. 0 | 4010 | 0·2 | „ „ „ | ---------+------------+---------+--------------------------+---------- Her curve of luminosity in the spectrum was next taken, and her readings are given in the table above. The curve is shown in Fig. 40. The shaded band beneath it applies to her curve. Miss W.’s luminosity curve is also repeated in the same figure for the sake of comparison.