Chemistry and Physics. 465 
SCIENTIFIC INTELLIGENCE. 
L CHEMISTRY AND Puysics. 
eed, by covering 
one-half the slit of the spectroscope with the metallic spark from 
meters n e of this spark is formed on the slit by 
Means of a lens, the spectrum, in the case of magnesium, showing 
the triple green ray 6 with great sharpness. On ng now 
lowering of the carbon be continued, the second, and at last the 
third, are reversed also. In this way the author has succeeded in’ 
Teversing rays in the spectra of sodium, thallium, lead, silver, 
aluminum i 
produced spontaneously by exterior cooling around each 
, Ixxili, 332, July, 1871. F. 
nd powerful o- Battery. — ry, 
rvented by Noé of Vienna, the negative metal is an alloy like 
rman silver, in the form of a wire; the saith also a secret 
roti 18 In cylinders, cast round the wire. is protected 
/tom the flame by a copper cylinder, insulated from the positive 
metal by a piece of mica. One of these elements equa’ lectro- 
votive power 1-24 to 1:36 Jacobi-Siemens’ units; therefore 9 to 10 
Noé’s elements equal one Daniell cell, and 2 Bunsen’s, 
0, one 0 
A battery of 72 elements, when arranged for intensity, decompo- 
M. Jour, Te Sertzs, Vor. III, No, 18.—Junz, 1872. 
