MAG 
Magnetic chart, of the U. States, 
E. Loomis, xxxiv, 290; xxxix, 
Ale 
compass, mariner’s, on the in- 
vention of, A. Humboldt, xl, 242. 
dip, in different parts of the 
world, 7. H. Perry, xlvii, 84. 
, at different places in 
Europe, xl, 30. 
, in Ireland, H. Lloyd, 
xxxv, 296. 
—-, at Perth, Scotland, xl, 
342. 
—— ——-, at St. Petersburg, xxi, 
382. 
, at different places in 
the U. States, xl, 380. 
silbidhy is Wocke,) XXxix, 
SO sixty 49s dil oe 
, —— , ibid, remarks on, 
Xxxix, 325. 
a DIGS FD, LOOMIS XXXIV | 
290f; xxxix, 41/; x1, 85. 
» at various places in 
Ohio and Michigan, EL. Loomis, 
Xxxvlil, 397. 
; ibid, at Cincin- 
nati, J. Locke, xl, 56. 
, at Philadelphia and 
Baltimore, A. D. Bache, xl, 
375. 
, at Baltimore, J. Locke 
and J. N. Nicollet, xlii, 239. 
, at Nantucket, 
Mitchell, x\vi, 157. 
, daily variation in, Kup- 
ffer, xxv, 194. 
and intensity determin- 
ed by one instrument, H. Lloyd, 
xxxvill, 179. 
discoveries by H. H. Sher- 
wood, xxxiv, 210. 
effects from Hare’s calorimo- 
tor, G. T. Bowen, v, 357. 
experiments, showing the ef- 
fect of cold and heat on steel 
bars, Kupffer, xxv, 194. 
influence of the sun’s rays, 
xiil, 188; xvii, 181. 
of the violet ray, xviii, 
W. 
171. 
150 
“M AG 
Magnetic instrument, new, called a 
Solar Index, M. Conant, x\lix, 
301.f 
iron, see Iron. 
intensity, at great elevations, 
J. D. Forbes, xxxi, 369. 
, at different places in 
Europe, xl, 30. 
, in Treland, H. Lloyd, 
xxxv, 296. 
, daily variation and 
changes in, H. Lloyd, xlvi, 391. 
, In different places in 
the United States, xl, 378. 
investigations, by W. Scores- 
by, xlvin, 33. 
needle, dipping, theory of ad- 
justing, T. H. Perry, xxxvii, 277. 
‘ , manipulations of, 
J. Locke, xlii, 235. 
, dip of, see Magnetic 
dip. 
, on the influence of the 
Aurora on, xxxiv, 285. 
, ibid, Franklin, 
XVl, 
148. 
—— ——,, ibid, J. Henry, xxii, 
143. 
, ibid, of Jan., 1837, New 
Haven, xxxil, 179. 
, ibid, in July, 1837, 
xxxill, 146. 
——. ibid, at Schenectady, 
Jan., 1837, &c., B. F. Joslin, 
xxxv, 152. 
, ibid, Nov. 14, 1837, E. 
C. Herrick, xxxiv, 269. 
, ibid, xl, 48. 
, ibid, May, 1840, at To- 
ronto, xl, 337. 
, ibid, as seen at Green- 
wich, xl, 338. 
, influence of coasts on 
the deflection of, xxviii, 62. 
: of heating to the 
temperature of boiling water, 
xxxvill, 180. 
—w—, influence of iron cool- 
ed to a low red heat, xxix, 348. - 
, Improvement in_ the 
manufacture of, A. Haton, xii, 14. 
