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The Binet-Simon tests of children's intelligence have been the subject of much discussion during the past few years, both in this country and in America. Much of this discussion seems to have been carried on, at times, without any knowledge of the original aim or purpose for which these tests were devised, and as if, so to speak, they were invented as a means for ascertaining the relative intellectual powers of all children, and so of affording to the teacher a ready and sure means of accurately classifying and grading the children under his charge.

This revised text covers electromagnetic waves and fields in great detail. It begins with a review of static electric and magnetic fields, providing results useful for static fields and time-dependent field problems in which the size of the device is small compared with the wavelength.