Transcriber's Notes

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Punctuation, hyphenation, and spelling were made consistent when a predominant preference was found in this book; otherwise they were not changed.

Simple typographical errors were corrected; occasional unbalanced quotation marks retained.

Ambiguous hyphens at the ends of lines were retained.

Text within some diagrams has been enlarged to improve readability.

Empty space in some diagrams has been removed to allow those diagrams to be enlarged for improved readability.

In some versions of this eBook, larger versions of some diagrams may be seen by clicking “(LARGER)”.

Page 163: Closing quotation mark added at the end of “voice pipes in the beginning.’”

Page 262: Opening quotation mark removed at “Mr. Churchill’s speech”.






                                                                                                                                                                                                                                                                                                           

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