WATCH & CLOCK ESCAPEMENTS ILLUSTRATED HOROLOGY BOOK
This is a wonderful document from an early 20th century book....
A Complete Study In Theory and Practice of the Lever, Cylinder and Chronometer Escapements, Together with a Brief Account of the Origin and Evolution of the Escapement in Horology - first printed in 1904
A quote from this book:
"In this treatise we do not propose to go into the history of this escapement and give a long dissertation on its origin and evolution, but shall confine ourselves strictly to the designing and construction as employed in our best watches. By designing, we mean giving full instructions for drawing an escapement of this kind to the best proportions."
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Check Out The Table Of Contents Of This Book
CHAPTER I - The Detached Lever Escapement
Making a pair of dividers
Delineating an escape wheel
Pallet and Fork Action
Establishing the center of pallet staff
Laying out escape-wheel teeth
How motion is obtained
Methods of making good drawing instruments
Spring and adjusting screw for drawing instruments
Consideration of detached lever escapement resumed
The neccesity for good instruments
Delineating the exit pallet
Delineating circular pallets
The amount of lock
Advantage of making large drawings
The club-tooth lever escapement
Relations of the several parts
Locating the inner angle of the exit pallet
Club-tooth lever with equidistant locking faces
Angular motion of escape wheel determined
A departure from former practices
An apt illustration
Locating the outer angle of the impulse planes
Making an escapement model
Imitation rubies for capping the top pivots
Profitable for explaining to a customer
How large screws are made
Fancy screwheads
How to do acid frosting
How to prepare the surface
How to etch the surface
How flat steel polishing is done
Smoothing and polishing
Knowledge that is most essential
What every workman should know to repair a watch
Educate the eye to judge of angular as well as linear extent
Fork and roller action
How to find the roller diameter from the legnth of the fork
Why thirty degrees of roller action is about right
HOw to set a fork and roller action right
HOw to dilineate the fork and roller
To determine the size of the jewel pin
The theory of the fork action
How to dilineate the prongs of a lever fork
The proper length of a lever
How to delineate the safety action
Restrict the frictional surfaces
Be fearless in repairs, if sure you are right
Study of an escapement error
How to adjust pallets to match the fork
How to set a jewel pin as it should be
About jewel-pin setters
How to make an angle measuring device
How the angular motion is measured
Testing lock and drop with our new device
A few experiments with our angle-measuring device
How to measure the angular motion of an escape wheel
How to balance controls the timekeeping of a watch
How barametric pressure affects a watch
Proportions of the double-roller escapement
Theoretical action of double roller considered
How to design a double-roller escapement
How the guard point is made
More about tangential lockings
Correct drawing required
Neurtal locks
Practical hints for lever escapements
The perfected lever escapement
when power is lost in the lever escapement
About the club-tooth escapement
How to locate the pallet action
"Action" drawings
Drawing an escapement to show angular motion
Practical problems in the lever escapement
To draw a pallet in any position
Higher mathematics applied to the lever escapement
How the basis for close measurements is obtained
Make a large escapement model
Practical lessons with fork and pallet action
Quiz problems in the detached lever escapement
How to measure escapement angles
Determination of "right" methods
Escapements compared
How to set pallet stones
How to make an escapement matching tool
Details of fitting up escapement matcher
Escapement matching device described
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CHAPTER II - THE CYLINDER ESCAPEMENT
Essential parts of the cylinder escapement
Drawing the cylinder escapement
Advantages gained in shaping
The outer diameter of the cylinder
Drawing a cylinder
The cylinder proper considered
Why the angular extent is increased
Making a working model
Proper shape of cylinder lips
Delineating an escape-wheel tooth while in action
CHAPTER III - THE CHRONOMETER ESCAPEMENT
Advantages of the chronometer
Frictional escapements in high favor
Faults in the detent escapement
Antagonistic influences
Factors that must be considered
Functions of the detent
obtaining the best conditions
Important considerations
Decisions arrived at by experience
Locating the center of the balance staff
How to set the discharging jewel
A good form of locking stone
The detent spring
Details of construction
Original designing of the escapement
Tangential lockings
The drop and draw considered
Fitting up of the foot
CHAPTER IV - HISTORY OF ESCAPEMENTS
Problems to be solved
Escapement the most essential part
The verge escapement
Oldest arrangement of a crown-wheel escapement
Galileo's experiments
The attainment of isochronism by Huygens
Another two-pendulum escapement
Correcting irregularities in the verge escapement
An invention that created much enthusiasm
Ingenious attempts at solution of a difficult problem
Various modifications
The gable escapement
CHAPTER V - PUTTING IN A NEW CYLINDER
Escape-wheel teeth vs. cylinder
Measuring the heights
Turning the pivots
How to use a cement chuck
Convenient tool for length measurement
Removing the lathe cement
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