75

Lever, proper length of, 61

Lever fork, horn of, 61
prongs of, 60

Lift, real and apparent, 112

Lifting angle, 114

Lock, amount of, 28
Defined, 85

Lock and drop testing, 69

Locking jewel, moving the, 149

Locking stone, good form of, 144

Lower plate, circular opening in, 56

M

Marine chronometer, number of beats to hour, 148

Mathematics, 95

Measuring tools, 171

Metal drawings, advantages of, 140

Motion, how obtained, 16

Movement holder, 110

N

Neutral lockings, 84

O

Original designing, 148

P

Pallet action, locating the, 90

Pallet-and-fork action, 12, 13, 17, 18

Pallet stones, how to set, 104

Pallets, adjusting to match the fork, 65

Paper for drawing, 11

Parts, relations of the, 32

Passing hollow, 62

Perfected lever escapement, 87

Pivots, turning, 172

Point of percussion, 139

Points for drawing instruments, 20

Polishing materials, 52

Power leaks, 16

Power lost in lever escapement, 87

Practical problems in the lever escapement, 98

R

Radial extent of outside of cylinder, 125

Ratchet-tooth escape wheel, 12

Recoil anchor escapement, 155

Recoil escapement, 154

Reduced gable escapement, 167

Retrograde motion, 36

Roller action, why 30 degrees, 55
Of double roller, 78

Roller diameter, determining the, 55

Ruling pen, 9

S

Safety action, 56

Scale of inches, 9

Screws, making extra large, 45

Screwheads, fancy, 45

Selecting new cylinder, 170

Shaping, advantages gained in, 116

Sheet steel, cutting, 48

Short fork, 100

Sound as indicator of correct action, 144

Spring, elasticity of, 133

Staking on a balance, 175

Steel, polishing, 49
Tempering, 49

Study drawings, 124

Systems of measurements, 114

T

Tangential lockings, 80, 148

Test gage for angular movement, 65

Theoretical action of double roller, 76

Timekeeping, controlled by balance, 73

Tool for length measurement, 174

Tools, measuring, 171

Triangle, 18

T-square, 9

U

Unlocking action, 56

Unlocking roller, 136

V

Verge escapement, 131, 155

W

Weight and inertia of balance, 133

Working model of cylinder escapement, 123

* * * * * *

THE WATCH ADJUSTER'S MANUAL

[Illust