[— needle,] dipping, theory of adjusting, 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, xvi, 148.
— —, ibid, J. Henry, xxii, 143.
— —, ibid, of Jan., 1837, New Haven, xxxii, 179.
— —, ibid, in July, 1837, xxxiii, 146.
— —, ibid, at Schenectady, Jan., 1837, &c., B. F. Joslin, xxxv, 152.
— —, ibid, Nov. 14, 1837, E. C. Herrick, xxxiv, 269.