Results of NPL measurements previously reported to the 10th IAU in 1958 are recalculated to give values of wavelengths as observed through the anode end of an Engelhard dc lamp and some possible systematic effects are discussed. The measurements are compared with others made by Kaufman and Phelps and it is found that means of the three sets of data may be relied upon to 0.0001 Å.
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The wavelength of the primary standard line was taken to be 6057.80211 Å.
Figures in brackets are standard deviations of tabulated values in 10−4 Å. The standard deviation of a single observation varies regularly from 5.0×10−4 Å at 6400 Å to 2.5×10−4 Å at 4300 Å.
Each CAO or ACO value at 125 mm is the mean of between 24 and 27 single observations. The number of observations at 400 mm varies from 2 to 28.
Table II
Summary of measurements of wavelengths (CAO configuration).
Mean wavelength (Å)
Residuals (10−4 Å)
NPL
Purdue
Alberta
6458.07181
−0.1
−0.1
+0.3
6422.80053
−1.1
+0.7
+0.4
6375.35101
−1.3
−0.1
+1.5
6238.07586
−0.2
−0.6
+0.8
6224.45393
−0.6
−0.3
+0.8
6153.10792
+0.8
−0.2
−0.6
6084.54409
+1.5
−0.9
−0.7
6037.50409
−2.1
0
+2.1
6013.81946
−0.1
+0.4
−0.3
5995.50898
+1.1
−0.8
−0.3
5881.52857
+3.1
−0.7
−2.3
5872.54155
−3.2
+0.5
+2.7
5868.37475
+0.5
−0.5
5834.47235
−1.1
+0.5
+0.5
5674.02386
−1.2
+1.2
5651.12863
−0.3
+0.7
−0.4
5581.93530
+0.8
0.0
−0.9
5571.83539
+1.6
+0.1
−1.7
5563.76899
+0.3
+0.1
−0.4
5522.04309
+2.1
−1.9
−0.3
5502.23726
+2.1
+1.4
−3.6
5492.46057
+1.4
−0.7
−0.6
5229.63188
−0.6
+0.6
4503.61622
+1.8
−0.2
−1.5
4464.94165
−0.7
+0.5
+0.2
4455.16674
+2.0
+0.6
−2.5
4426.43166
+1.0
+0.4
−1.5
4420.00116
+4.4
−4.5
4411.60581
+1.5
+0.9
−2.5
4401.20119
+0.5
+1.1
−1.6
4377.35038
+1.5
−0.8
−0.6
4363.86683
−0.7
+1.7
−1.1
4352.58191
+0.8
+0.9
−1.7
4301.69547
0.0
+1.3
−1.2
4287.69212
−0.2
+1.3
−1.5
4284.17173
+1.9
+0.7
−2.5
4275.17145
+0.5
−0.5
4264.48480
−0.2
0.0
+0.1
4185.64916
−0.6
+0.5
Adopted value of wavelength of primary standard:
NPL: 6057.80211 Å
Purdue: 6057.80208 Å
Alberta: 6057.80211 Å
The three sets of data are given equal weight in forming mean values. The standard deviations of the NPL and Alberta data appear to be comparable while data for assessing systematic errors are not available apart from the present comparisons.
For the Paschen notation, 34 additional wavelengths in this region, and 21 additional wavelengths between 3992 and 3425 Å, see Phelps.3
Table III
Comparison of photographic Fabry–Perot and photoelectric Michelson results.
The wavelength of the primary standard line was taken to be 6057.80211 Å.
Figures in brackets are standard deviations of tabulated values in 10−4 Å. The standard deviation of a single observation varies regularly from 5.0×10−4 Å at 6400 Å to 2.5×10−4 Å at 4300 Å.
Each CAO or ACO value at 125 mm is the mean of between 24 and 27 single observations. The number of observations at 400 mm varies from 2 to 28.
Table II
Summary of measurements of wavelengths (CAO configuration).
Mean wavelength (Å)
Residuals (10−4 Å)
NPL
Purdue
Alberta
6458.07181
−0.1
−0.1
+0.3
6422.80053
−1.1
+0.7
+0.4
6375.35101
−1.3
−0.1
+1.5
6238.07586
−0.2
−0.6
+0.8
6224.45393
−0.6
−0.3
+0.8
6153.10792
+0.8
−0.2
−0.6
6084.54409
+1.5
−0.9
−0.7
6037.50409
−2.1
0
+2.1
6013.81946
−0.1
+0.4
−0.3
5995.50898
+1.1
−0.8
−0.3
5881.52857
+3.1
−0.7
−2.3
5872.54155
−3.2
+0.5
+2.7
5868.37475
+0.5
−0.5
5834.47235
−1.1
+0.5
+0.5
5674.02386
−1.2
+1.2
5651.12863
−0.3
+0.7
−0.4
5581.93530
+0.8
0.0
−0.9
5571.83539
+1.6
+0.1
−1.7
5563.76899
+0.3
+0.1
−0.4
5522.04309
+2.1
−1.9
−0.3
5502.23726
+2.1
+1.4
−3.6
5492.46057
+1.4
−0.7
−0.6
5229.63188
−0.6
+0.6
4503.61622
+1.8
−0.2
−1.5
4464.94165
−0.7
+0.5
+0.2
4455.16674
+2.0
+0.6
−2.5
4426.43166
+1.0
+0.4
−1.5
4420.00116
+4.4
−4.5
4411.60581
+1.5
+0.9
−2.5
4401.20119
+0.5
+1.1
−1.6
4377.35038
+1.5
−0.8
−0.6
4363.86683
−0.7
+1.7
−1.1
4352.58191
+0.8
+0.9
−1.7
4301.69547
0.0
+1.3
−1.2
4287.69212
−0.2
+1.3
−1.5
4284.17173
+1.9
+0.7
−2.5
4275.17145
+0.5
−0.5
4264.48480
−0.2
0.0
+0.1
4185.64916
−0.6
+0.5
Adopted value of wavelength of primary standard:
NPL: 6057.80211 Å
Purdue: 6057.80208 Å
Alberta: 6057.80211 Å
The three sets of data are given equal weight in forming mean values. The standard deviations of the NPL and Alberta data appear to be comparable while data for assessing systematic errors are not available apart from the present comparisons.
For the Paschen notation, 34 additional wavelengths in this region, and 21 additional wavelengths between 3992 and 3425 Å, see Phelps.3
Table III
Comparison of photographic Fabry–Perot and photoelectric Michelson results.