A Treatise on Modern Horology in Theory and Practice
This book is the classic french horology book (844 pages in length) by Claudius Saunier, translated by Julien John Stanislaus Tripplin and Edward Rigg. It was originally published by Crosby Lockwood in 1887.
ESCAPEMENTS.
Classification of escapements. Recoil and dead-beat escapements. Comparison between dead-beat and detached escapements
General Principles. Elements of Applied Mechanics.—Forces. Mechanical Effect Power. Resistance. Difference between force exercised by a body at rest and in motion.
What is gained in power is lost in velocity. Time necessary for body to attain maximum velocity. Inertia - Function of inertia in escapement. Light wheels.
Separation of working parts when in contact. Adhesion. Laws of pressure and motion. Percussion. Impact. Volume and Mass.—Density.—Gravity.—Mass and weight.
Centrifical force.—The lever.—Applications. Inclined plane.—Inclined plane in motion. Composition and resolution of forces.—Parallelogram of forces
Tangential escapements. Danger of purely geometrical solutions. Mechanical complication. Theoretical and Practical Considerations.—The moderator and regulator
Retention of oil at contacts—Attraction. Capillarity. The lead. The lift. Lifting and supplementary arcs. Ratio of length of impulse arm to diameter of balance
Ratio of radius of friction to diameter of balance. Different kinds of friction. Experimental evidence that certain friction is necessary. Propositions relating to friction.
Tabular Summary of general mechanical principles
Preliminary. Advantages and defects. Proportions adopted by Thiout, Berthoud, Tavan, Moinet, and Wagner. Table showing differences between these several authorities.
Principles. Tangential escaping. To design the epcapement. The opening of the pallets. The lift. Supplementary arc. Recoil. Inclination of teeth.
Table of dimensions Practical details bearing on above conditions. Details relating to the verve with and without ruby pallets. The balance-wheel. Pivots and pivot-holes.
The balance. Balance-spring. To mark the lifting points. The drop. Effect of great variations in the motive force. To examine the escapement.
CYLINDER ESCAPEMENTS.
Half-timing. To determine the best relation between balance and balance-spring. Summary of the three main elements of timing. Notes on some observations of Berthoud, Jodin, and Tavemier.
Four experiments by Berthoud and Tavemier with a view to determine the best proportions.
