Colour vision - Sir William de Wiveleslie Abney

Table XI.—B. C.’s Curves (see [Fig. 34]).

I.	II.	III.	IV.	V.	VI.
Scale Number.	Wave- length.	Adopted reading in hundred thousandths.	Persistency curve 12,500 readings in V.	Luminosity of original beam.	Absolute luminosity of extinction III. and V.
61	6839	7500	1·6
60	6728	5500	2·3	·5	27·5
59	6622	4000	3·1	1	40
58	6520	2800	4·5	2	56
57	6423	2000	6·2	4	80
56	6330	1500	8·3	6	90
55	6242	1150	10·8	8	92
54	6152	950	13·1	11·5	109·2
53	6074	750	16·6	16	120
52	5996	580	21·6	21·5	125
51	5919	430	29	28·5	122·5
50	5850	350	36	37	129·5
49	5783	275	45·5	47	129·2
48	5720	215	58	60	129
47	5658	170	73·4	76	129·2
46	5596	140	89·3	92	129
45	5538	125	100	98	122·5
44	5481	125	100	100	125
43	5427	130	96·1	97	126
42	5373	150	83	85	127·5
41	5321	180	69·4	65	117
40	5270	215	59	45	96·7
39	5221	250	50	30	75
38	5172	290	43	1·5	723·2
37	5128	335	37	16	53·6
36	5055	380	33	11·5	43·7
34	5002	500	25	7	35
32	4994	650	19	4	26
30	4848	850	14	2·5	23·3
28	4776	1100	11·4	2	22
26	4707	1500	8·3	1·5	22
24	4639	2000	6·2	1	20
22	4578	2700	4·6	5	13·5
18	4459	4750
14	4349	7500
10	4245	11000

Table XII.—M.’s Luminosity Curve compared with the Normal (see [Fig. 30]).

I.	II.	III.	IV.	V.	VI.	VII.
Scale number.	Wave- length.	Mean reading.	Mean reading × 1·8.	Normal luminosity curve, centre of eye.	Difference of last two columns.	Difference × 5·15.
61	6839	2	3·6	4	·4	2·57
59	6621	7	12·6	12·5	-·1	·51
57	6423	18	32·4	33	+·6	3·09
55	6242	36	64·8	65	·2	1·03
53	6074	49	88·2	89·5	1·3	6·71
52	5996	52	95·4	96·5	1·1	5·66
51	5919	54	97·2	99·5	2·3	11·8
50	5850	54	97·2	100	2·8	14·4
49	5782	52·5	94·5	99·5	5·0	25·7
48	5720	50	90	97	7·0	36·0
47	5658	46	82·8	92·5	9·7	49·9
46	5596	41	73·8	87	13·2	68·0
44	5481	32	57·6	75	17·4	89
42	5373	23	43·2	62.5	19·3	99
40	5270	17	30·6	50	19·4	100
38	5172	10	17·5	35·5	18	93
36	5085	4	7·2	24	16·8	86·5
34	5002	1·0	1·8	14·5	12·7	65·5
31	4885	·5	·7	6·5	5·8	37·7
28	4776	0	0	4	4	20·6

Table XIII.—Miss W.’s Curves (see [Fig. 39]).

Scale number.	Wave- length.	Readings.	Extinction in 1/100000.	Persistency curve.
63	7082	0
62	6957	1
60	6728	7
58	6520	18
57	6423	28
56	6330	43
54	6152	76	900	2
52	5996	90	250	7
50	5850	95	130	13·5
48	5720	93	60	29
46	5596	83	34	51
44	5481	71	22	80
42	5321	58	18·5	92
40	5270	46	17·5	100
38	5172	32	18	94
36	5085	21	19·5	90
34	5002	12·5	22	79
32	4924	7	27	65
30	4848	4·5	34	51
28	4776	3·0	40	38·5
25	4675	1·5	60	29
20	4518	0·4	250	7
19	4488	0·0	350	5
16	4404	—	600

INDEX

	PAGE
Absorption by the Yellow Spot	[90]
Artificial Spectrum	[33]
Cases of Defective Colour Vision unrecognised	[67]
Clerk Maxwell’s Colour-Box	[42]
Clerk Maxwell’s Colour Curves	[47]
Colour, and the Sensations required to produce it	[50]
Colour Blindness due to Disease	[137]
Colour-Blind Persons see a Grey in the Spectrum	[65]
Colour Discs	[32]
Colour Fields	[13]
Colour Matches made by the Colour Blind	[70]
Colour Patch Apparatus	[18]
Colour Patch Apparatus, Original Form of	[19]
Comparison of the Young and Hering Theory	[189]
Complex Colours matched by Simple Colours	[22]
Contrast Colours	[187]
Curious Case of Congenital Colour Blindness, A	[164]
Dalton Colour Blindness	[58]
Daltonism, or Colour Blindness	[57]
Defective Form Vision connected with Colour Deficiency due to Disease	[138]
Definition at different parts of the Retina	[11]
Enfeebled Spectrum Luminosity	[98]
Exhibiting Colour Blindness by Colour Discs	[74]
Extinction and Persistency Curves of Green-Blind Persons	[127]
Extinction and Persistency Curves of Monochromatic Vision	[125]
Extinction and Persistency Curves of Red-Blind Persons	[127]
Extinction of Colour	[105]
Extinction of Light by the Centre and Periphery of the Eye	[114]
Extinction of Colour of equal Luminosity	[110]
Extinction of Light in the Spectrum	[109]
Eye: Explanation of its Functions	[3]
Fatigue of the Retina	[6], [30]
Field of View	[10]
Fovea Centralis	[4]
Fundamental Light	[34]
Green-Blind Person’s Description of the Spectrum, A	[64]
Green Monochromatic Vision	[131]
Helmholtz Diagram of Sensations	[38]
Heredity in Colour Blindness	[58]
Hering’s Colour Vision Theory	[52]
Hering’s Theory not tri-chromic	[57]
Holmgren’s Colour Tests	[169]
Kœnig’s Colour Sensation Curves	[49]
Lissajou’s Figures	[37]
Luminosity of the Spectrum to the Centre of the Eye, the Fovea Centralis, and outside the Yellow Spot	[88]
Luminosity of the Spectrum to partially Colour Blind	[86]
Luminosity of the Spectrum to the Colour Blind	[81]
Luminosity of the Spectrum to the Normal Eyed	[78]
Malingerers, Detection of	[185]
Matching Colours by Mixtures of Simple Colours	[26]
Maxwell’s Colour Equations	[202]
Maxwell’s Curves for Red Blindness	[69]
Measurement of Colour Fields	[207]
Monochromatic Vision and the Spectrum	[66]
Number of Cones in the Eye	[8]
Optograms	[9]
Pellet Tests	[146]
Pendulum Experiments	[36]
Persistency Curves	[119]
Primary Colours	[25]
Primary Pigment Colours	[27]
Progressive Atrophy of the Optic Nerve	[153]
Purkinje’s Figures	[7]
Purples	[24]
Red and Green matched	[72]
Red-Blind Person’s Description of the Spectrum, A	[63]
Retina, Structure of	[6]
Retinal Fatigue	[6], [30]
Rods and Cones	[8]
Seat of Visual Sensation	[7]
Sensation Curves in Terms of Luminosity	[93]
Sensitiveness of the Eye	[121]
Simple Colours	[17]
Simulation of Red and Green Blindness	[175]
Spectrum described by the Tobacco Blind, The	[143]
Spectrum Test for Colour Blindness	[181]
Table of Wave-Lengths	[17]
Tables	[211]
Tobacco Ambyopia	[140]
Tobacco Blindness, Examples of	[148]
Violet Blindness	[73]
Visibility of an Object in light of different Colours	[123]
Visual Purple	[9]
White Monochromatic Vision	[158]
Wool Test, The	[170]
Yellow Spot	[4]
Yellow Spot and Colour Mixtures, The	[28]
Young’s Theory, Modification of	[196]

Works on Photography
BY
Capt. W. de W. ABNEY, C.B., D.C.L., F.R.S.,
Late Royal Engineers.