In what follows, italic text is denoted by _underscores_ while bold text is denoted by =equal signs=. Small capitals in the original text have been transcribed as ALL CAPITALS. Superscripted text is prefixed by the ‘^’ symbol. Braces ‘{}’ may enclose the text when necessary to avoid ambiguity. Subscripted text is always enclosed in braces ‘{}’ but will not be preceded by a ‘^’. [Illustration: A CHRISTMAS LECTURE AT THE ROYAL INSTITUTION: “WAVES AND RIPPLES IN THE AIR.”…
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