THE 
AMERICAN 
JOURNAL OF SCIENCE AND ARS. 
[SECOND SERIES.] 
a. 
> 
Art. XVIL—Photometric Experiments. Part Frrst.—On a 
simple form of Photometer for determining the amount of Light 
reflected by Metallic Surfaces at different incidences ; by OGDEN 
N. Roop, Prof. of Physics in Columbia College. 
at the next equally certain that it has been It hence fol- 
lows that no photometer of this form is adapted for investiga- 
Hons at all aiming at a d. character. 
B to whom Physics as well as Chemistry is 
& 
Superiority of this latter principle is evident from the mere state- 
ment, raf it only mere to investigate how the p 1 ad- 
van, can best be realized in actual practice. It 1s, _ believe, 
Senerally admitted by those who have used Bunsen’s photometer, 
A. Jour. §ci—Szconp Szrms, Vor. XLIX, No. 146,—Mancu, 1870. 
