gee ee eet oe Pe i 
H. Becquerel— Magnetic Properties of Nickeliferous Iron. 229 
Duboscq, about 1850, to one of Brewster’s stereoscopes and also 
subsequently by Helmholtz. A similar a apeaie is espe- 
cially described by Professor Emerson in this Journal, Noy., 
made 
indeed be difficult to Byales any wholly n ew anche in the 
ree nebo of stereoscopes. The present instrument was de- 
sed for a specific purpose, which it ad Gaal successfully. 
40 West 40th St., New York, Jan. 21st, 1882 
Art. XXII. — On the no es Properties of a Specimen of 
arouse Iron from St. Catarina, Brazil, as first pointed 
ut by Lawrence Smith, by HENRI BECQUEREL :* with a note 
ies. LAWRENCE SMITH. 
it is very teh attracted a the magnet, but if a Sasrnts is 
cistind me from the Gliese at the Garden of Plants. A 
small bar was prepared, weighing 2731 grams, and 18:5™™ 
long, 5-2™" broad, and 3°8™™ thick. This bar was compared 
with a small bar of Swedish iron, of the same length and 
width, with about the same dimensions. he experiments 
St. Catarina Tron. 
Intensity. yeah Natural co ee ag we! Heated to redness. pegrae toes ee 
Sine of | | Relation 
the d Mag: | Relation|to the n Relation 
ions of vi netis | Ma cocte | to o Swedish Magnetic \to ahd tive Tron — netic |to awed 
needle. | weight.| weight. | iron weight. ish iro not eight. [ish iron. 
gs eas | : | heated. pues 
i mg. mmg } 
01600 | 60) 32 0053 | 64 | 1°066| 20° | 60 | 1-000 
0°3000 | 238 | 12°6 | 0053 | 244 | 1025 | 193 | 232 | 0-974 
0°5600 fon 405 | 0054 | 1702 1:004 ISS jf. 449 0°986 
0°7000 | 1110 | 588 4 0°053 | ane bear ewer ties 
9°8300 Si 1489 ai ae. Oo 052 1489 1:000 19°1 1454 0-976 
* oe from Comptes Rendus, xciii, p. 794, 1881. 
+ Comp endus, ae p- 
¢ Annales “Er Chimie et de Physique, 5th series, xvi. 1879. (Magnetism of 
Nickel ; and Cobalt.) 
