A Popular History of Astronomy During the Nineteenth Century / Fourth Edition

by Agnes M. Clerke

[536] Bull. Phil. Soc. Washington, vol. iii., p. 118.

[537] Mem. R. A. S., vol. xli., 1879.

[538] Astr. Nach., No. 1,737.

[539] Correspondence with Newton, pp. 181-184; Ranyard, Mem. Astr. Soc., vol. xli., p. 501.

[540] S. P. Langley, Wash. Obs., 1876, App. iii., p. 209; Nature, vol. lxi., p. 443.

[541] Schuster (Proc. Roy. Soc., vol. xxxv., p. 154) measured and photographed about thirty.

[542] Abney, Phil. Trans., vol. clxxv., p. 267.

[543] Proc. Roy. Soc., vol. xxxiv., p. 409. Experiments directed to the same end had been made by Dr. O. Lohse at Potsdam, 1878-80. Astr. Nach., No. 2,486.

[544] The sensitiveness of chloride of silver extends from h to H; that is, over the upper or more refrangible half of the space in which the main part of the coronal light is concentrated.

[545] Proc. Roy. Soc., vol. xxxiv., p. 414.