In transcribing this book, the proofreaders found and corrected several minor typographical errors which did not affect the sense of the text. In the caption to Figure 541, the equation for the voltage of a Weston cell at different temperatures was missing a digit "1" and this has been corrected. There is a reference to a Figure 619 but no such figure exists in the original text. There are references to a Figure 119 and a Figure 443; these presumably exist in one of the preceding volumes of the series. Throughout, the use of italic type is indicated by _underscores_. In equations, superscripts are indicated by a caret and braces, as in X^{2} for "X squared". Subscripts are indicated by unde…
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