— —, ibid, xl, 48.
— —, ibid, May, 1840, at Toronto, xl, 337.
— —, ibid, as seen at Greenwich, xl, 338.
— —, influence of coasts on the deflection of, xxviii, 62.
— —, — of heating to the temperature of boiling water, xxxviii, 180.
— —, influence of iron cooled to a low red heat, xxix, 348.
— —, improvement in the manufacture of, A. Eaton, xii, 14.
— —, improvement in, reply to the same, xii, 232.
— —, made of thin plates not in contact, W. Scoresby, xxxiv, 398.
— —, oscillations of, differing near different metals, xv, 182.