414 Scientific Intelligence. 
reflected rays can excite phosphorescence and are acted upon by 
a magnet like es el ars a ie rays.— Ann. der Physik und 
hemie, No. 2, 1882, pp. 2 
12. Influence ay NT seid "hanna ng upon the magnetic 
properties of steel and tron.—Many investigations upon the rela- 
e 
by heat, by cic and by annealing processes fo the resulting 
changes i in magnetic conditions have been ma appears 
from the paper ar Louis M. Cheesman that the effect of mechan- 
ical hardening has not been properly investigated, and this paper 
contains the results of his investigation upon this point. The 
method of research consisted simply in determining the magnetic 
moment of the magnetic bar after it had been subjected to well 
devised mechanical pressures. The result of his investigations is 
summed up as follows: Iron in a mechanically hard condition 
can receive more permanent magnetism than in a soft condition. 
he magnetic moment of a steel magnet in a mechanically hard 
oa phage on is greater or smaller than in a soft condition, according 
‘the ratio of its diameter to its len gth is less or greater than a 
paren limit.—Ann. der Physik und Chemie, No. 2, 1882, pe 
204-225, 
13. Storaye of Electricity.—A commission consisting of “iia 
Allard, LeBlane, Joubert, Potier and Tresea, experimented 
upon Faure’s batt tery in Paris, Fannury, 1882. The e bat- 
tery was composer 35 elements, the lead plates of aie a form 
weighing each, with included liquid, 43°700k*, The le ry elec- 
trodes were a with minium to the amount of 10** per 
square meter. The liquid consisted of distilled water wink the 
addition of one-tenth of its weight of pure weg oe acid. The 
charging machine was of the Siemens type the armature having a 
resistance of 0°27 ohms, and the inductor 1945 ohms. The cur- 
rent of discharge was passed through a series of Maxim’s inean- 
- descent lamps. The authors state, in general, that they obtained 
the light “ ove carcel with an expenditure of 5-80%s™ of electri 
cal work per second. They were also led to the conclusion that 
it is Gusiblageots to charge the battery with the feeblest current 
possible and to prolong the duration of the Lee: ge. The results 
of the investigation are summed up as follow : The ¢ arge of the 
ota 
orse power during 22" 45”, or I-horse power during 35" 26™, 
The battery received in reality only 0°66 of this work, the rest 
having been dissipated in the work of excitation. 
The exterior electrical work during the entire duration of the 
discharge oe to 3809000%*"; the mechanical work con- 
sumed was 9570000*", but of this amount furnished only 
6382000" was retained by the battery. Hence the amount re- 
covered during the discharge was 0°40 of the total work, and 0°60 
of the stored-up work. The employment therefore of the accum- 
ulator has cost 0°40 of the work furnished by the wt lnseecnadiiccs soi 
machine which might have been utilized in other ways. The 
