# A Treatise on Electricity and Magnetism/Errata

Page 26, l. 3 from bottom, *dele* 'As we have made no assumption', &c. *down to* l. 7 of p. 27, 'the expression may then be written', and substitute as follows:—

Let us now suppose that the curves for which is constant form a series of closed curves surrounding the point on the surface for which has its minimum value, , the last curve of the series, for which , coinciding with the original closed curve *s*.

Let us also suppose that the curves for which is constant form a series of lines drawn from the point at which to the closed curve *s*, the first , and the last, , being identical

Integrating (8) by parts the first term with respect to a and the second with respect to , the double integrals destroy each other. The line integral,

,

is zero, because the curve , is reduced to a point at which there is but one value of and of .

The two line integrals,

+ ,

destroy each other, because the point is identical with the point .

The expressions (8) is therefore reduced to

| (9) |

Since the curve is identical with the closed curve s, we may write this expression

p. 80, in equations (3), (4), (6), (e), (17), (18), (19), (20), (21), (22), *for read *.

p. 82, l. 3, for * read *.

p. 83, in equations (28), (29), (30). (31), *for* *read*

p. 83,„ in equation (29), *insert - before* the second member.

p. 105, 1. 2, for read .

p. 108, equation (1), *for* *read* .

p. 108,„ equation„ (2), *for* *read* .

p. 108,„ equation„ (3), *for* , *read* .

p. 108,„ equation„ (4), for *read* .

p. 113, l. 4, *for* *read* .

p. 113,„ l. 5, for read .

p. 111, I. 5, *for* *read* .

p. 124, last line, *for* *read* .

p. 125, lines 3 and 4, *transpose* within *and* without; l. 16, *for*
*read* ; and l. 18, *for* *read* .

p. 128, lines 11, 10, 8 from bottom *for read *.

p. 149, l. 24, *for* equpotential *read* equipotential. p. 159, l. 3, *for* *read* .

p. 159,„ l. 2 from bottom, *for* *read* .

p. 163, l. 20, *for* *read* .

p. 164, equation (34), *for* *read*

p. 179, equation (76), *for* *read* .

p. 185, equation (24), *for* read .

p. 186, l. 5 from bottom, *for* 'The surface-density on the elliptic plate' *read* The surface-density on either side of the elliptic plate.

p. 186, equation (30), *for* *read* .

p. 188, equation (38), *for* *read* .

p. 196, l. 27, *for* *read* .

p. 197, equation (10) should be .

p. 204, l. 15 from bottom, *dele* either.

p. 215, l. 4, *for* *read* .

p. 234, equation (13), *for* read .

p. 335, *dele* last 14 lines.

p. 336, l. 1, *dele* therefore.

p. 336,„ l. 2, *for* 'the potential at to exceed that at by ,' *read* a current, , from to .

p. 336,„ l. 4, *for* ' to will cause the potential at to exceed that at by the same quantity ,' *read* to will cause an equal current from to .

p. 351, l. 3, *for* *read* .

p. 351,„ l. 5, *read* .

p. 355, last line, *for* *read* .

p. 356, equation (12), *for* *read* .

p. 365, in equations (12), (15), (16), *for* *read* .

p. 366, equation (3), *for* *read* .

p. 367, l. 5, *for* *read* .

p. 368, equation (14), *for* *read* .

p. 397, l. 1, *for* *read* .

p. 404, at the end of Art. 350 insert as follows:—

When , the resistance to be measured, , the resistance of the battery, and , the resistance of the galvanometer, are given, the best values of the other resistances have been shewn by Mr. Oliver Heaviside (*Phil. Mag.*, Feb. 1873) to be

.