Referring to a series of jacks, described in the U.S. Code of Federal Regulations, Title 47, part 68, providing a standardized physical and electrical interface to the public switched telephone network (PSTN). See also jack, Part 68, and PSTN.
Integrating by parts in (II), we get J e = ikr d7 pc-11 / d (e r - ay= rJ Z d y - r / 1 dY, in which the integrated terms at the limits vanish, Z being finite only within the region T.
' S 'e ' ',l0"0 t !rJ,GheJt,, seveld ?
Each of the four co-ordinates, n', x', y are functions of %, rj, x, y; and if it be assumed that the field of view and the aperture be infinitely small, then, n, x, y are of the same order of infinitesimals; consequently by expanding ', ii', x', y in ascending powers of E, rt, x, y, series are obtained in which it is only necessary to consider the lowest powers.
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