Anon 
Wrist Watch Maintenance – Correcting Balances, Hairsprings and Pivots 

This antiquarian book contains a comprehensive guide to fixing watches, with information on correcting balances, hairsprings and pivots. Written in clear, concise language and containing useful charts, tables, diagrams, and formulas, this text constitutes a must-have for those with a practical interest in the topic, and makes for a great addition to collections of allied literature. The chapters of this volume include: Middle Temperature Error, Berthoud’s Experiments, Effect of Temperature upon Springs, Safe Range of Temperature, Airy’s Experiments, Adjustment of Chronometers, Permanent Compensation Balance… among others. This antiquarian book is being republished now complete with a new introduction on the history of clocks and watches.