It is found that the absolute refractive index of any optical glass studied attains a minimum value at some temperature, and that the minimum refractive index is attained at decidedly higher temperatures with long wave-lengths than with short wave-lengths. Absorption bands in the ultraviolet are known to advance toward longer wave-lengths when an absorbing glass is warmed from liquid air temperature. Because of its closer proximity, the absorption band’s advance would be accompanied by a more rapid increase of absolute refractive index N in the short wave end than in the long wave end of the spectrum, with rising temperature. At the same time expansion decreases the physical density and so tends to diminish N with rising temperature. At some particular temperature the two effects of temperature change may cancel each other. At lower temperatures than this, the density effect may prevail and N fall with rising temperature, while at higher temperatures than that for minimum N, the absorption effect may exceed the density effect, and the N must rise with rising temperature.
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Taken from Bausch and Lomb Optical Company, Optical Glass Catalog current in 1940.
Refraction constants of sample determined by Bausch and Lomb Optical Company.
Table II
Transmission of optical glass.* Thickness 10 mm, reflection deducted.
BSC–1
BSC–2
C–1
LBC–2
DBC–1
DBC–3
CF–1
BF–1
DF–2
EDF–3
Cut-off in mμ
300
296
301
306
328
320
310
316
326
350
T at 300 mμ
0.0
0.8
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
320 mμ
25.0
30.0
19.5
5.0
0.0
0.0
10.5
1.0
0.0
0.0
340 mμ
64.5
53.0
55.5
25.0
2.0
9.5
87.5
59.0
20.0
0.0
360 mμ
90.0
76.0
84.0
47.5
22.0
82.5
97.0
94.0
72.5
6.5
380 mμ
98.0
95.0
97.2
92.5
96.8
98.5
99.0
98.0
84.5
47.0
400 mμ
99.5
99.5
99.3
99.5
99.5
99.4
99.5
99.5
90.5
70.0
420 mμ
99.5
99.5
99.3
99.5
99.5
99.4
99.5
99.5
93.5
85.5
440 mμ
99.5
99.5
99.3
99.5
99.5
99.4
99.5
99.5
95.5
92.0
460 mμ
99.5
99.5
99.3
99.5
99.5
99.4
99.5
99.5
97.0
96.2
480 mμ
99.5
99.5
99.3
99.5
99.5
99.4
99.5
99.5
98.0
98.5
500 mμ
99.5
99.5
99.3
99.5
99.5
99.4
99.5
99.5
98.9
99.3
600 mμ
99.5
99.5
99.3
99.5
99.5
99.4
99.5
99.5
99.5
99.5
700 mμ
99.5
99.5
99.3
99.5
99.5
99.4
99.5
99.5
99.5
99.5
800 mμ
99.5
98.5
99.3
99.2
99.4
99.4
99.5
99.5
99.5
99.5
1000 mμ
99.5
94.5
99.3
97.2
96.6
99.4
99.5
99.5
99.5
99.5
2000 mμ
88.8
85.0
95.0
90.5
65.0
80.5
70.0
88.5
99.5
99.5
3000 mμ
0.5
0.0
17.5
0.6
0.0
0.0
0.9
0.9
6.0
3.0
4000 mμ
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
1.2
Cut-off in mμ
3200
3000
4000
3200
2900
2850
3350
3250
3500
4100
This tabulation of transmission of the ten Bausch and Lomb Optical Company glasses was prepared in that Company’s laboratory, using freshly polished samples from the pots with which it supplied the interferometer samples.
Table III
Changes in absolute index of refraction from 0° to t°, (ΔN), for Bausch and Lomb Company glasses.
t° λ
− 194
− 170
− 145
− 120
− 100
− 80
− 60
− 40
− 20
0
20
40
60
80
100
ΔN/1° at 20°
Borosilicate Crown BSC–1
4801A
+ 15.9
+ 11.8
+ 7.6
+ 3.95
+ 1.60
− 0.11
− 1.10
− 1.37
− 0.96
0
+ 1.73
+ 4.0
+ 7.0
+ 10.4
+ 14.3
0.101
5087A
+ 17.5
+ 13.4
+ 9.2
+ 5.34
+ 2.81
+ 0.87
− 0.38
− 0.93
− 0.77
0
+ 1.46
+ 3.53
+ 6.2
+ 9.4
+ 13.1
0.087
5894A
+ 20.4
+ 16.4
+ 11.9
+ 7.8
+ 4.92
+ 2.56
+ 0.84
− 0.18
− 0.45
0
+ 0.89
+ 2.38
+ 4.51
+ 7.2
+ 10.4
0.059
6440A
+ 21.8
+ 17.7
+ 13.3
+ 9.1
+ 6.1
+ 3.51
+ 1.53
+ 0.23
− 0.30
0
+ 0.70
+ 1.99
+ 3.89
+ 6.3
+ 9.2
0.050
Borosilicate Crown BSC–2
4801A
+ 1.0
− 2.0
− 4.7
− 6.7
− 7.57
− 7.64
− 6.9
− 5.3
− 2.9
0
+ 3.6
+ 8.0
+ 13.0
+ 18.7
+ 25.1
0.200
5087A
+ 2.63
− 0.41
− 3.22
− 5.3
− 6.3
− 6.6
− 6.0
− 4.7
− 2.6
0
+ 3.4
+ 7.5
+ 12.4
+ 17.9
+ 24.0
0.189
5462A
+ 4.53
+ 1.05
− 2.17
− 4.6
− 5.8
− 6.1
− 5.6
− 4.3
− 2.4
0
+ 3.2
+ 7.2
+ 11.8
+ 16.7
+ 22.4
0.180
5894A
+ 5.6
+ 2.0
− 1.32
− 3.8
− 5.0
− 5.4
− 5.0
− 3.8
− 2.1
0
+ 3.0
+ 6.5
+ 10.8
+ 15.6
+ 21.1
0.160
6440A
+ 6.9
+ 3.6
+ 0.5
− 2.1
− 3.6
− 4.4
− 4.44
− 3.7
− 2.2
0
+ 2.8
+ 6.1
+ 10.2
+ 14.9
+ 20.3
0.152
Crown C–1
4801A
− 5.8
− 7.7
− 9.2
− 9.9
− 9.9
− 9.0
− 7.5
− 5.5
− 2.9
0
+ 3.6
+ 7.9
+ 12.7
+ 17.9
+ 23.5
0.199
5087A
− 3.7
− 5.7
− 7.3
− 8.3
− 8.5
− 7.9
− 6.7
− 4.9
− 2.7
0
+ 3.1
+ 6.8
+ 11.3
+ 16.4
+ 22.1
0.171
5462A
− 1.6
− 3.7
− 5.5
− 6.7
− 7.1
− 6.7
− 5.8
− 4.3
− 2.3
0
+ 2.9
+ 6.4
+ 10.5
+ 15.2
+ 20.4
0.159
5894A
+ 0.3
− 2.0
− 3.9
− 5.3
− 5.9
− 5.8
− 5.1
− 3.8
− 2.1
0
+ 2.7
+ 6.0
+ 9.8
+ 14.0
+ 18.6
0.150
6440A
+ 2.2
− 0.16
− 2.3
− 3.8
− 4.5
− 4.5
− 4.1
− 3.1
− 1.7
0
+ 2.3
+ 5.2
+ 8.7
+ 12.4
+ 16.7
0.131
Light Barium Crown LBC–2
4801A
+ 20.2
+ 15.3
+ 10.3
+ 6.0
+ 3.1
+ 1.1
− 0.25
− 0.8
− 0.62
0
+ 1.4
+ 3.4
6.2
9.6
13.6
0.085
5087A
+ 22.1
+ 17.0
+ 11.9
+ 7.3
+ 4.3
+ 1.9
+ 0.5
− 0.4
− 0.6
0
+ 1.1
+ 2.9
5.3
8.3
11.8
0.072
5894A
+ 25.4
+ 20.3
+ 15.0
+ 10.2
+ 6.8
+ 4.1
+ 2.1
+ 0.9
+ 0.19
0
+ 0.4
+ 1.4
3.2
5.7
8.7
0.036
6440A
+ 28.4
+ 23.1
+ 17.5
+ 12.3
+ 8.5
+ 5.6
+ 3.1
+ 1.5
+ 0.4
0
+ 0.14
+ 0.9
2.3
4.1
6.4
0.025
Dense Barium Crown DBC–1
4801A
+ 9.6
+ 5.4
+ 1.3
− 1.9
− 3.7
− 4.6
− 4.4
− 3.6
− 2.1
0
+ 3.6
+ 6.5
10.6
15.1
20.1
0.162
5087A
+ 11.8
+ 7.6
+ 3.3
0.0
− 2.0
− 3.3
− 3.7
− 3.3
− 2.1
0
+ 2.8
+ 5.7
9.4
13.7
18.4
0.143
5462A
+ 13.7
+ 9.3
+ 5.1
+ 1.4
− 1.0
− 2.2
− 2.9
− 2.6
− 1.8
0
+ 2.3
+ 5.2
8.6
12.4
16.6
0.131
5894A
+ 14.8
+ 10.8
+ 6.5
+ 3.0
+ 0.5
− 1.3
− 2.3
− 2.4
− 1.7
0
+ 2.1
+ 4.6
7.8
11.5
15.7
0.116
6440A
+ 16.6
+12.2
+ 7.8
+ 3.9
+ 1.4
− 0.4
− 1.3
− 1.6
− 1.2
0
+ 1.8
+ 4.1
6.9
10.1
13.7
0.103
Dense Barium Crown DBC–3
4801A
− 14.3
− 15.7
− 16.8
− 17.1
− 16.6
− 15.2
− 13.0
− 9.8
− 5.3
0
+ 5.9
+12.2
19.0
26.2
33.8
0.305
5087A
− 11.7
− 13.9
− 15.5
− 16.1
− 15.7
− 14.3
− 11.9
− 8.7
− 4.7
0
+ 5.5
+11.5
18.0
24.8
32.0
0.276
5894A
− 7.5
− 9.9
− 11.8
− 12.9
− 12.9
− 12.0
− 10.1
− 7.6
− 4.3
0
+ 4.9
+10.3
16.0
22.1
28.4
0.256
6440A
− 5.2
− 7.9
− 10.1
− 11.4
− 11.5
− 10.9
− 9.2
− 6.8
− 3.8
0
+ 4.5
+ 9.5
14.9
20.7
26.7
0.237
Crown Flint CF–1
4801A
− 2.6
− 5.7
− 8.5
− 10.5
− 11.2
− 11.0
− 9.8
− 7.5
− 4.2
0
+ 4.8
+10.4
16.9
24.1
32.0
0.261
5087A
− 0.1
− 3.2
− 6.1
− 8.3
− 9.3
− 9.5
− 8.8
− 6.9
− 4.0
0
+ 4.5
+ 9.7
15.9
22.8
30.4
0.244
5894A
+ 4.6
+ 1.0
− 2.4
− 5.1
− 6.5
− 7.1
− 6.8
− 5.4
− 3.1
0
+ 3.7
+ 8.1
13.4
19.4
26.0
0.205
6440A
+ 7.4
+ 3.6
0.0
− 3.1
− 4.8
− 5.7
− 5.8
− 4.8
− 2.9
0
+ 3.3
+ 7.3
12.1
17.7
23.9
0.184
Barium Flint BF–1
4801A
− 0.4
− 3.7
− 6.7
− 8.9
− 9.9
− 9.9
− 8.9
− 6.9
− 3.9
0
4.5
9.8
15.9
22.7
30.1
0.246
5087A
+ 3.6
+ 0.1
− 3.3
− 5.9
− 7.3
− 7.7
− 7.3
− 5.8
− 3.3
0
3.9
8.7
14.3
20.4
27.3
0.218
5894A
+ 9.3
+ 5.8
+ 2.2
− 0.8
− 2.8
− 4.0
− 4.5
− 4.0
− 2.5
0
2.8
6.5
10.9
16.1
21.5
0.162
6440A
+ 13.6
+ 9.2
+ 4.7
+ 1.0
− 1.3
− 2.7
− 3.3
− 3.0
− 1.8
0
2.4
5.6
9.5
14.1
19.2
0.140
Dense Flint DF–2
4360A
− 40.4
− 42.0
− 42.4
− 40.8
− 37.8
− 33.1
− 26.8
− 19.0
− 9.9
0
11.2
23.4
36.8
51.3
66.9
0.586
4801A
− 26.8
− 29.1
− 30.6
− 30.5
− 28.9
− 26.0
− 21.5
− 15.6
− 8.3
0
9.3
19.7
31.1
43.5
57.0
0.492
5087A
− 20.8
− 23.3
− 25.1
− 25.5
− 24.6
− 22.5
− 18.9
− 13.9
− 7.5
0
8.5
18.0
28.4
39.8
52.1
0.450
5462A
− 14.7
− 18.3
− 21.0
− 22.3
− 21.9
− 20.1
− 16.8
− 12.2
− 6.5
0
7.6
16.2
25.7
36.1
47.4
0.405
5894A
− 9.2
− 13.0
− 16.2
− 18.0
− 18.1
− 16.8
− 14.3
− 10.4
− 5.6
0
7.0
14.8
23.6
33.2
43.7
0.370
6440A
− 4.9
− 8.7
− 12.0
− 14.2
− 15.0
− 14.6
− 12.9
− 9.9
− 5.6
0
6.3
13.4
21.3
30.1
39.7
0.334
Extra Dense Flint EDF–3
(−192.5°)
(−146°)
4801A
− 77.3
− 75.6
− 72.3
− 66.4
− 60.1
− 51.9
− 41.8
− 29.8
− 15.8
0
16.5
34.3
53.4
73.6
94.7
0.858
5087A
− 65.5
− 65.4
− 63.6
− 59.1
− 53.6
− 46.2
− 36.9
− 25.8
− 13.8
0
15.1
31.4
48.7
66.8
85.9
0.784
5894A
− 44.8
− 46.2
− 46.3
− 44.2
− 40.9
− 35.8
− 28.9
− 20.5
− 10.7
0
12.2
25.4
39.6
54.7
70.5
0.634
6440A
− 36.0
− 38.1
− 39.1
− 38.1
− 35.5
− 31.3
− 25.4
− 18.0
− 9.4
0
11.0
23.0
35.9
49.6
63.9
0.575
Table IV
Characteristics of samples from Schott and Genossen glasses (years 1910–1912).
Reference number
Name
Specific gravity at 21°C
nD
nF–nC
nD–nC
nF–nD
nG–nF
BSC
Borosilicate
(2.47)
1.5093
0.00788
64.6
0.00236
0.00552
0.00449
Crown
(1.507)
2
Prism Crown (R)
(2.46)
1.5156
0.00804
64.1
0.00240
0.00564
0.3832
(1.51)
3
Ordinary Light
(3.20)
1.57983
0.01381
42.0
0.00398
0.00983
0.00826
Flint (0.276)?
(1.580)
4
Ordinary Silicate
(3.71)
1.62161
0.01720
36.2
0.00492
0.01229
0.01054
Flint (R) 0.103
(1.628)
5
Extra Dense
(4.47)
1.7180
0.02438
29.4
0.00685
0.01753
—
Flint (0.41)
(1.717)
perhaps a duplication of No. 6
6
Extra Dense
(4.48)
1.7180
0.02438
29.4
0.00685
0.01753
—
Flint 0.41
(1.716)
7
Heavy Silicate
(4.78)
1.75453
0.02743
27.5
0.00768
0.01975
0.01646
Flint (R) (0.165)
(1.751)
1
Unknown
(3.48)
(1.610)
(0.0105)
(57.4)
(Wave-length = 4358A
4861A
5461A
5894A
6563A
n = 1.627
1.617
1.612
1.610
1.6065)
Items marked (R) were identified by Messrs. Rayton and Turner.
Quantities in ( ) were determined by Molby.
All other names and quantities were furnished by the factory that made up the samples. The specific gravities of these agreed with those found by Molby.
Table V
Eastman Kodak Company optical glasses; characteristics determined by the Company (1947).
Taken from Bausch and Lomb Optical Company, Optical Glass Catalog current in 1940.
Refraction constants of sample determined by Bausch and Lomb Optical Company.
Table II
Transmission of optical glass.* Thickness 10 mm, reflection deducted.
BSC–1
BSC–2
C–1
LBC–2
DBC–1
DBC–3
CF–1
BF–1
DF–2
EDF–3
Cut-off in mμ
300
296
301
306
328
320
310
316
326
350
T at 300 mμ
0.0
0.8
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
320 mμ
25.0
30.0
19.5
5.0
0.0
0.0
10.5
1.0
0.0
0.0
340 mμ
64.5
53.0
55.5
25.0
2.0
9.5
87.5
59.0
20.0
0.0
360 mμ
90.0
76.0
84.0
47.5
22.0
82.5
97.0
94.0
72.5
6.5
380 mμ
98.0
95.0
97.2
92.5
96.8
98.5
99.0
98.0
84.5
47.0
400 mμ
99.5
99.5
99.3
99.5
99.5
99.4
99.5
99.5
90.5
70.0
420 mμ
99.5
99.5
99.3
99.5
99.5
99.4
99.5
99.5
93.5
85.5
440 mμ
99.5
99.5
99.3
99.5
99.5
99.4
99.5
99.5
95.5
92.0
460 mμ
99.5
99.5
99.3
99.5
99.5
99.4
99.5
99.5
97.0
96.2
480 mμ
99.5
99.5
99.3
99.5
99.5
99.4
99.5
99.5
98.0
98.5
500 mμ
99.5
99.5
99.3
99.5
99.5
99.4
99.5
99.5
98.9
99.3
600 mμ
99.5
99.5
99.3
99.5
99.5
99.4
99.5
99.5
99.5
99.5
700 mμ
99.5
99.5
99.3
99.5
99.5
99.4
99.5
99.5
99.5
99.5
800 mμ
99.5
98.5
99.3
99.2
99.4
99.4
99.5
99.5
99.5
99.5
1000 mμ
99.5
94.5
99.3
97.2
96.6
99.4
99.5
99.5
99.5
99.5
2000 mμ
88.8
85.0
95.0
90.5
65.0
80.5
70.0
88.5
99.5
99.5
3000 mμ
0.5
0.0
17.5
0.6
0.0
0.0
0.9
0.9
6.0
3.0
4000 mμ
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
1.2
Cut-off in mμ
3200
3000
4000
3200
2900
2850
3350
3250
3500
4100
This tabulation of transmission of the ten Bausch and Lomb Optical Company glasses was prepared in that Company’s laboratory, using freshly polished samples from the pots with which it supplied the interferometer samples.
Table III
Changes in absolute index of refraction from 0° to t°, (ΔN), for Bausch and Lomb Company glasses.
t° λ
− 194
− 170
− 145
− 120
− 100
− 80
− 60
− 40
− 20
0
20
40
60
80
100
ΔN/1° at 20°
Borosilicate Crown BSC–1
4801A
+ 15.9
+ 11.8
+ 7.6
+ 3.95
+ 1.60
− 0.11
− 1.10
− 1.37
− 0.96
0
+ 1.73
+ 4.0
+ 7.0
+ 10.4
+ 14.3
0.101
5087A
+ 17.5
+ 13.4
+ 9.2
+ 5.34
+ 2.81
+ 0.87
− 0.38
− 0.93
− 0.77
0
+ 1.46
+ 3.53
+ 6.2
+ 9.4
+ 13.1
0.087
5894A
+ 20.4
+ 16.4
+ 11.9
+ 7.8
+ 4.92
+ 2.56
+ 0.84
− 0.18
− 0.45
0
+ 0.89
+ 2.38
+ 4.51
+ 7.2
+ 10.4
0.059
6440A
+ 21.8
+ 17.7
+ 13.3
+ 9.1
+ 6.1
+ 3.51
+ 1.53
+ 0.23
− 0.30
0
+ 0.70
+ 1.99
+ 3.89
+ 6.3
+ 9.2
0.050
Borosilicate Crown BSC–2
4801A
+ 1.0
− 2.0
− 4.7
− 6.7
− 7.57
− 7.64
− 6.9
− 5.3
− 2.9
0
+ 3.6
+ 8.0
+ 13.0
+ 18.7
+ 25.1
0.200
5087A
+ 2.63
− 0.41
− 3.22
− 5.3
− 6.3
− 6.6
− 6.0
− 4.7
− 2.6
0
+ 3.4
+ 7.5
+ 12.4
+ 17.9
+ 24.0
0.189
5462A
+ 4.53
+ 1.05
− 2.17
− 4.6
− 5.8
− 6.1
− 5.6
− 4.3
− 2.4
0
+ 3.2
+ 7.2
+ 11.8
+ 16.7
+ 22.4
0.180
5894A
+ 5.6
+ 2.0
− 1.32
− 3.8
− 5.0
− 5.4
− 5.0
− 3.8
− 2.1
0
+ 3.0
+ 6.5
+ 10.8
+ 15.6
+ 21.1
0.160
6440A
+ 6.9
+ 3.6
+ 0.5
− 2.1
− 3.6
− 4.4
− 4.44
− 3.7
− 2.2
0
+ 2.8
+ 6.1
+ 10.2
+ 14.9
+ 20.3
0.152
Crown C–1
4801A
− 5.8
− 7.7
− 9.2
− 9.9
− 9.9
− 9.0
− 7.5
− 5.5
− 2.9
0
+ 3.6
+ 7.9
+ 12.7
+ 17.9
+ 23.5
0.199
5087A
− 3.7
− 5.7
− 7.3
− 8.3
− 8.5
− 7.9
− 6.7
− 4.9
− 2.7
0
+ 3.1
+ 6.8
+ 11.3
+ 16.4
+ 22.1
0.171
5462A
− 1.6
− 3.7
− 5.5
− 6.7
− 7.1
− 6.7
− 5.8
− 4.3
− 2.3
0
+ 2.9
+ 6.4
+ 10.5
+ 15.2
+ 20.4
0.159
5894A
+ 0.3
− 2.0
− 3.9
− 5.3
− 5.9
− 5.8
− 5.1
− 3.8
− 2.1
0
+ 2.7
+ 6.0
+ 9.8
+ 14.0
+ 18.6
0.150
6440A
+ 2.2
− 0.16
− 2.3
− 3.8
− 4.5
− 4.5
− 4.1
− 3.1
− 1.7
0
+ 2.3
+ 5.2
+ 8.7
+ 12.4
+ 16.7
0.131
Light Barium Crown LBC–2
4801A
+ 20.2
+ 15.3
+ 10.3
+ 6.0
+ 3.1
+ 1.1
− 0.25
− 0.8
− 0.62
0
+ 1.4
+ 3.4
6.2
9.6
13.6
0.085
5087A
+ 22.1
+ 17.0
+ 11.9
+ 7.3
+ 4.3
+ 1.9
+ 0.5
− 0.4
− 0.6
0
+ 1.1
+ 2.9
5.3
8.3
11.8
0.072
5894A
+ 25.4
+ 20.3
+ 15.0
+ 10.2
+ 6.8
+ 4.1
+ 2.1
+ 0.9
+ 0.19
0
+ 0.4
+ 1.4
3.2
5.7
8.7
0.036
6440A
+ 28.4
+ 23.1
+ 17.5
+ 12.3
+ 8.5
+ 5.6
+ 3.1
+ 1.5
+ 0.4
0
+ 0.14
+ 0.9
2.3
4.1
6.4
0.025
Dense Barium Crown DBC–1
4801A
+ 9.6
+ 5.4
+ 1.3
− 1.9
− 3.7
− 4.6
− 4.4
− 3.6
− 2.1
0
+ 3.6
+ 6.5
10.6
15.1
20.1
0.162
5087A
+ 11.8
+ 7.6
+ 3.3
0.0
− 2.0
− 3.3
− 3.7
− 3.3
− 2.1
0
+ 2.8
+ 5.7
9.4
13.7
18.4
0.143
5462A
+ 13.7
+ 9.3
+ 5.1
+ 1.4
− 1.0
− 2.2
− 2.9
− 2.6
− 1.8
0
+ 2.3
+ 5.2
8.6
12.4
16.6
0.131
5894A
+ 14.8
+ 10.8
+ 6.5
+ 3.0
+ 0.5
− 1.3
− 2.3
− 2.4
− 1.7
0
+ 2.1
+ 4.6
7.8
11.5
15.7
0.116
6440A
+ 16.6
+12.2
+ 7.8
+ 3.9
+ 1.4
− 0.4
− 1.3
− 1.6
− 1.2
0
+ 1.8
+ 4.1
6.9
10.1
13.7
0.103
Dense Barium Crown DBC–3
4801A
− 14.3
− 15.7
− 16.8
− 17.1
− 16.6
− 15.2
− 13.0
− 9.8
− 5.3
0
+ 5.9
+12.2
19.0
26.2
33.8
0.305
5087A
− 11.7
− 13.9
− 15.5
− 16.1
− 15.7
− 14.3
− 11.9
− 8.7
− 4.7
0
+ 5.5
+11.5
18.0
24.8
32.0
0.276
5894A
− 7.5
− 9.9
− 11.8
− 12.9
− 12.9
− 12.0
− 10.1
− 7.6
− 4.3
0
+ 4.9
+10.3
16.0
22.1
28.4
0.256
6440A
− 5.2
− 7.9
− 10.1
− 11.4
− 11.5
− 10.9
− 9.2
− 6.8
− 3.8
0
+ 4.5
+ 9.5
14.9
20.7
26.7
0.237
Crown Flint CF–1
4801A
− 2.6
− 5.7
− 8.5
− 10.5
− 11.2
− 11.0
− 9.8
− 7.5
− 4.2
0
+ 4.8
+10.4
16.9
24.1
32.0
0.261
5087A
− 0.1
− 3.2
− 6.1
− 8.3
− 9.3
− 9.5
− 8.8
− 6.9
− 4.0
0
+ 4.5
+ 9.7
15.9
22.8
30.4
0.244
5894A
+ 4.6
+ 1.0
− 2.4
− 5.1
− 6.5
− 7.1
− 6.8
− 5.4
− 3.1
0
+ 3.7
+ 8.1
13.4
19.4
26.0
0.205
6440A
+ 7.4
+ 3.6
0.0
− 3.1
− 4.8
− 5.7
− 5.8
− 4.8
− 2.9
0
+ 3.3
+ 7.3
12.1
17.7
23.9
0.184
Barium Flint BF–1
4801A
− 0.4
− 3.7
− 6.7
− 8.9
− 9.9
− 9.9
− 8.9
− 6.9
− 3.9
0
4.5
9.8
15.9
22.7
30.1
0.246
5087A
+ 3.6
+ 0.1
− 3.3
− 5.9
− 7.3
− 7.7
− 7.3
− 5.8
− 3.3
0
3.9
8.7
14.3
20.4
27.3
0.218
5894A
+ 9.3
+ 5.8
+ 2.2
− 0.8
− 2.8
− 4.0
− 4.5
− 4.0
− 2.5
0
2.8
6.5
10.9
16.1
21.5
0.162
6440A
+ 13.6
+ 9.2
+ 4.7
+ 1.0
− 1.3
− 2.7
− 3.3
− 3.0
− 1.8
0
2.4
5.6
9.5
14.1
19.2
0.140
Dense Flint DF–2
4360A
− 40.4
− 42.0
− 42.4
− 40.8
− 37.8
− 33.1
− 26.8
− 19.0
− 9.9
0
11.2
23.4
36.8
51.3
66.9
0.586
4801A
− 26.8
− 29.1
− 30.6
− 30.5
− 28.9
− 26.0
− 21.5
− 15.6
− 8.3
0
9.3
19.7
31.1
43.5
57.0
0.492
5087A
− 20.8
− 23.3
− 25.1
− 25.5
− 24.6
− 22.5
− 18.9
− 13.9
− 7.5
0
8.5
18.0
28.4
39.8
52.1
0.450
5462A
− 14.7
− 18.3
− 21.0
− 22.3
− 21.9
− 20.1
− 16.8
− 12.2
− 6.5
0
7.6
16.2
25.7
36.1
47.4
0.405
5894A
− 9.2
− 13.0
− 16.2
− 18.0
− 18.1
− 16.8
− 14.3
− 10.4
− 5.6
0
7.0
14.8
23.6
33.2
43.7
0.370
6440A
− 4.9
− 8.7
− 12.0
− 14.2
− 15.0
− 14.6
− 12.9
− 9.9
− 5.6
0
6.3
13.4
21.3
30.1
39.7
0.334
Extra Dense Flint EDF–3
(−192.5°)
(−146°)
4801A
− 77.3
− 75.6
− 72.3
− 66.4
− 60.1
− 51.9
− 41.8
− 29.8
− 15.8
0
16.5
34.3
53.4
73.6
94.7
0.858
5087A
− 65.5
− 65.4
− 63.6
− 59.1
− 53.6
− 46.2
− 36.9
− 25.8
− 13.8
0
15.1
31.4
48.7
66.8
85.9
0.784
5894A
− 44.8
− 46.2
− 46.3
− 44.2
− 40.9
− 35.8
− 28.9
− 20.5
− 10.7
0
12.2
25.4
39.6
54.7
70.5
0.634
6440A
− 36.0
− 38.1
− 39.1
− 38.1
− 35.5
− 31.3
− 25.4
− 18.0
− 9.4
0
11.0
23.0
35.9
49.6
63.9
0.575
Table IV
Characteristics of samples from Schott and Genossen glasses (years 1910–1912).
Reference number
Name
Specific gravity at 21°C
nD
nF–nC
nD–nC
nF–nD
nG–nF
BSC
Borosilicate
(2.47)
1.5093
0.00788
64.6
0.00236
0.00552
0.00449
Crown
(1.507)
2
Prism Crown (R)
(2.46)
1.5156
0.00804
64.1
0.00240
0.00564
0.3832
(1.51)
3
Ordinary Light
(3.20)
1.57983
0.01381
42.0
0.00398
0.00983
0.00826
Flint (0.276)?
(1.580)
4
Ordinary Silicate
(3.71)
1.62161
0.01720
36.2
0.00492
0.01229
0.01054
Flint (R) 0.103
(1.628)
5
Extra Dense
(4.47)
1.7180
0.02438
29.4
0.00685
0.01753
—
Flint (0.41)
(1.717)
perhaps a duplication of No. 6
6
Extra Dense
(4.48)
1.7180
0.02438
29.4
0.00685
0.01753
—
Flint 0.41
(1.716)
7
Heavy Silicate
(4.78)
1.75453
0.02743
27.5
0.00768
0.01975
0.01646
Flint (R) (0.165)
(1.751)
1
Unknown
(3.48)
(1.610)
(0.0105)
(57.4)
(Wave-length = 4358A
4861A
5461A
5894A
6563A
n = 1.627
1.617
1.612
1.610
1.6065)
Items marked (R) were identified by Messrs. Rayton and Turner.
Quantities in ( ) were determined by Molby.
All other names and quantities were furnished by the factory that made up the samples. The specific gravities of these agreed with those found by Molby.
Table V
Eastman Kodak Company optical glasses; characteristics determined by the Company (1947).