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This work surveys the history and technology of measuring time, tracing devices from ancient sundials and water-clocks through medieval verge-escapement mechanisms to later pendulum and modern electrical systems, and explaining principles, design details, and accuracy issues. It blends historical narrative with practical descriptions and illustrations of movements, escapements, and gear teeth, comments on conceptual problems in teaching and understanding measurement, and offers technical appendices such as on the shape of wheel teeth, aiming to inform both general readers and practical clockmakers about the development and mechanics of timekeeping.
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 unpaired quotation marks were retained.
Ambiguous hyphens at the ends of lines were retained.
Square roots are represented as √(values).
Index not checked for proper alphabetization or correct page references.
Page 16: “six o’clock” was printed as “six clock”; changed here.