Ordinary Meeting, January 10th, 1865. 
E. W. Binney, F.R.S., F.G.S., Vice-President, in the 
Chair. 
Dr. Roscoe exhibited some very interesting photographs 
of the fixed lines in the solar spectrum made by Mr. Ruther- 
ford of New York. These photographs exhibit groups of 
thousands of lines extending from near the line b in the 
green to beyond FI in the violet, and serve as a most valuable 
confirmation of the accuracy of Kirchhoff’s maps. Each line 
in these maps can be easily and distinctly traced in the 
photograph, whilst many bands drawn as single ones by 
Kirchhoff are seen in the magnified photograph to consist of 
bundles of fine lines. These photographs were prepared 
with three 60° bisulphide of carbon prisms. 
Dr. Roscoe also exhibited two fine photographic prints of 
the moon, enlarged by Mr. Rutherford from negatives taken 
by him in New York with an 11 jin. object glass of 14ft. 
focal length, which he had ground with special reference to 
the highly refrangible rays, and which is therefore unfit for 
ordinary telescopic purposes. 
Mr. Baxendell, and Mr. Wilkinson, F.R.A.S., expressed 
their opinion that Mr. Rutherford’s prints were decidedly 
sharper than any photographs of the moon they had seen. 
Proceedings Lit. & Phil, Society.— Vol, IY.— No. 8.— Session 1864-5. 
