143 
PHYSICAL AND MATHEMATICAL SECTION, 
Annual Meeting, March 30th, 1875. 
Alfeed Beothers, F.RA.S., President of the Section, 
in the Chair. 
The following gentlemen were elected officers of the 
Section for the ensuing year : — 
IPrcsiUcnt, 
E. W. BINNEY, F.E.S., F.O.S, 
Ficc=l^rcsiUcnts. 
ALFRED BROTHERS, F.R.A.S. 
JOSEPH BAXENDELL, F.R.A.S. 
®;rcasurcr. 
SAMUEL BROUGHTON. 
Stmtarp. 
G. V. VERNON, F.R.A.S., F.M.S. 
“Photography as applied to Eclipse Observations,” by 
Alfred Brothers, F.KA.S. 
Since 1860, when photography was first applied to eclipse 
observations, almost every eclipse of the sun has been 
photographically recorded- — from 1860 to 1868 for the pur- 
pose chiefly of determining the nature of the red promi- 
nences; and in 1870 and 1871 to ascertain whether the 
corona is an appendage of the sun or an effect produced in 
our own atmosphere. Previous to 1870 the ordinary tele- 
scope, uncorrected for the chemical rays, had been almost 
exclusively used. But in 1870 it was determined to adopt a 
properly corrected photographic lens, and by a graduated series 
of exposures to obtain if possible the whole pictorial effect. 
This method was successful, and has been adopted in all 
eclipse work since. That more suitable apparatus has not 
been employed may be due to the fact that the funds pro- 
Proceedings — Lit. & Phil. Soc.— Vol. XIV.—No. 13. — Session 1874-75, 
