From over 200 observations of the decreasing spin rate of Vanguard I made during the year since its launching, eddy-current induction theory yields 0.115 +/- 0.001 gauss as the mean magnetic field normal to the spin axis of the satellite. This measured value agrees with that deduced from Bauer's model of the earth's dipole field.
Nr. 4227. 4 4 6 6 4 6 3. 0.65 4 0.85 4 0.59 4 0.81 4 0.65 4 0.80 4 Observations of double stars. By Charles P. Olivier and Ra@h E. Wilson. 2.47 4 2.67 4 2. 0 2 4 2.17 4 2.60 4 These observations are a continuation of those published in A. N. 4166. The data given for each star are the same as for those in that paper, with the exception of one column added to give the observer's initial, and that the numbers used to designate each star are taken from Burnham's >General Cataloguea instead of from the :,Reference Catalogue of Southern Double Stars<. However, the name of its discoverer and its coordinates are still taken from the latter. In all, the following tables contain 420 observations of I 16 double stars, measured with the 66 cm refractor by R. B. Wilson and C. P. Olivier. Those observed by the former were measured during 1906 and 1907, while those measured by the latter covered the two previous years also to some extent. Taking the mean results for both observers, it is found that 14 pairs of distance less than I " were measured, 52 between I " and 2' , 31 between 2" and 3", and only 19 wider than 3", The same methods of selecting the observing lists and of measuring the stars were followed which were explained in A. N. 4166, except that, as a rule, one recorded while the other observed, thus adding somewhat to the accuracy of the work. The seven stars, found by C. P. Olivier and here published for the first time, are assumed to be new since they are not found in Burnham's :,General Catalogue<. Their estimated magnitudes are as follows : No. I 9.
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