EE NE ae ee ERT ene eh eRe eee CTR I ee ee eee RE TRS Te NE Se 
1918.] The Fifth Indian Science Congress. CXxix 
more specially so in view of the close quantitative pracy which Geiger 
and Nuttall have found to exist between ng ranges the transforma- 
tion constants of the parent substance Haters. the ranges of a 
i ined by e 
a ieep, dire « tubes and a mano series experiments, the 
critical pressure within the pene a a ae whieh the impression on the 
sensitive plate is just produced, or just fails to be produ per a is determined 
nly ‘gonrermegl experiments have so far been carried out, but these show 
clearly that the ranges are a few millimeters anes than the values already 
assigned = them. The following advantages are claimed for the photo- 
graphic m 
me is Sh objective and less subjective than any of the other 
met ore 
2. The reco is permanent. 
3. The lee are bataulatiee, 
Electric discharge through hydrogen and helium, Pt. I, 
Hydrogen.—By D. N. Mauxix and A. B. Das 
all the Philosophical prem site ar for June 1907, Prot. 
M. an Wileon d Mr. Martyr described t bectpatd ted of hydrogen con- 
ined in a Vadsiden tube of de la sda pat tend found eg it was | 
: arge a 
: ard this an illustration of the general erratic 
behavio oo acre discharge exis hydrogen which many physicists 
ied, 
i : repeating the experiment with tubes of various lengths and 
induction coils of various E.M.Fs., I roti that the rotatory phenomenon 
in hydrogen, as a other gases, but the conditions have to be 
he p 
i — present oe r is to investigate these conditions and 
lained on theoretical groun 
ad theoretical afb eps of this law is noteworthy, and is also 
_ Ona new method of solving boundary value problems in 
area physics in which the ee. is an ellip- 
—By Bisyurt Buusan Datr 
he first lon to attempt with any success a : problaea involving an 
sit of t unequal ase es as the boundary, was E. Mathieu ! who 
ed how ro problem could be reduced to the solution of reap 
er 
their unmanageable that he contented himself wi 
‘ en np for the special case of an cllipsoid revolution: oi. og 
©n improved = the results of Mathieu in ce: 
, olay de Cunha hiihisiads 3 ch. Ix. 
