67 
Ordinary Meeting, January 9th, 1866. 
R. Angus Smith, Ph.D., F.R.S., &c., President, 
in the Chair. 
Mr. Eddowes Bowman, M.A., gave an extended series of 
striking illustrations of the principal phenomena of polarised 
light. 
PHOTOGRAPHICAL SECTION. 
December 14th, 1865. 
J. P. Joule, LL.D., F.R.S., Vice-President of the Section, 
in the Chair. 
Mr. Joseph Sidebotham read a paper “ On the Applica- 
tion of Measuring Rods to Photographic Pictures.” 
The author referred to a paper on this subject read last 
Session ( Proceedings , vol. iv , p. 113), in which he advocated 
the use of graduated rods being placed in certain positions in 
buildings or landscapes of which photographs were to be 
taken, whereby correct measurements might be afterwards 
made on the finished picture. He now briefly alluded to 
certain corrections which would be necessary before these 
measurements could be considered perfectly accurate. 
Proceedings— Lit. & Phil. Society— Yol. V.— No. 8,— Session 1865-66. 
