308 Scientific Intelligence. 
ork in the infra red. Mr. Hough described a new form of 
Sensitometer for use in photography. Mr. Nichols read a 
h 
measure, The instrument consisted of a spectroscope provided 
with a Nicols prism and a totally reflecting prism. The inten- 
sity of the spectrum could be reduced known amounts by the 
Nicols prism, and the reflecting prism allowed the light reflected 
from the pigment to be compared with the proper portion of the 
solar spectrum. Mr. Nichols ated: that he had found that the 
tions is very consta nt and can serve as a me piecal measure of 
ignal Service, gave a deat tion of a oposed statistical 
method of studying the ey ency and is racter of thunder 
A temporary . 
subsection of sectio on B was then formed, before which Professor 
Abbe presented various papers on seismology and t ekdgeg: 
tization of observation of core ate and electri The 
st noteworthy discussion that occurred w the all Phe- 
enon. Mr. de H ° j 
1 showe h 
electromagnetism demanded an effect of the nature discove 
by Mr. Hall, and also said that many years ago he discovered 
‘ ays an 
Sir William Thomson then gave a pieces) representatio 
the phenomenon. A paper by Mr. Loudon on the theo 
thick lenses contained some interesting geometrical constructions 
Aa i ae i ng 
e 
ee 
