THE TELLURIC LINES OF THE SOLAR SPECTRUM-continued. Oscillation Frequency in Vacuo Horizon Reduction to Vacuum Altitude THE TELLURIC LINES OF THE SOLAR SPECTRUM-continued. Interim Report of the Committee consisting of Professor THOrpe, Professor HUMMEL (Secretary), Dr. PERKIN, Professor Russell, Captain ABNEY, and Professor STROUD, on the Action of Light upon Dyed Colours. Drawn up by the Secretary. THE primary object of the work of this Committee is to determine accurately the relative fastness to light of all the various colours at present employed by the dyer of textile fabrics. This is to be attained. |