Escape-wheel teeth vs. cylinder, 169

  Escape-wheel tooth in action, delineating an, 126

  Exit pallet, 26

  Experiments of Galileo, 158

  Experiments with a chronometer, 142

  Extent of angular impulse, 118

  F

  “Fall” defined, 106

  Faults in the detent escapement, 132

  Fixed rules, of little value to student, 137

  Flexure of gold spring, 146

  Foot, fitting up the, 151

  Fork, testing the, 71

  Fork action, 30
    Theory of, 59

  Fork and roller action, 54

  Formulas for delineating cylinder escapement, 115

  Frictions, 24

  Frictional escapement, 131, 132

  Frictional surfaces, 63

  Fusee, 131

  G

  Gable escapement, 167

  Gage, a new, 172

  Graham anchor escapement, 155

  Gold spring, 146

  Guard point, 79
    Material for, 79

  Gummy secretion on impulse and discharging stones, 147

  H

  Heights in cylinders, how obtained, 171

  Hole jewels, distance apart, 140

  I

  Imaginary faults in cylinders, 129

  Impulse angle, 118

  Impulse arc, extent of, 134

  Impulse jewel set oblique, 147

  Impulse planes, locating outer angle of, 39

  Impulse roller, 136

  Incline of teeth, 122

  Inertia of balance, 133

  Inventions of
    Berthoud, 163
    Bethune, 165
    Clement, 166
    Dr. Hook, 162
    Harrison, 161
    Hautefeuille, 161
    Huygens, 158
    Leroy, 163
    Thiout, 165

  J

  Jewel pin, determining size, 58
    Cementing in, 67
    Settings, 66

  Jewel-pin setters, 67

  L

  Lathe cement, 173
    Removing, 175

  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