Atmospheric disturbances, 74

  Attainment of isochronism, 159

  B

  Balance, how it controls timekeeping, 73
    Weight and inertia of, 133

  Balance spring, inventor of, 132

  Banking slot of cylinder, 112

  Bankings, effect of opening too wide, 63

  Bar compasses, 21

  Barometric pressure, 74

  Basis for close measurements, 96

  C

  Cement chuck, how to use, 173

  Chronometer detent, importance of light construction, 136

  Chronometer escapement, 131, 155
    Four principal parts of, 134

  Circular pallets, 27

  Club-tooth escapement, 30, 34

  Club-tooth lever escapement with circular pallets and
    tangential lockings, 83

  Crown-wheel escapement, 155

  Cylinder, drawing a, 120
    Outer diameter of, 116
    Putting in a new, 169

  Cylinder escapement, 155
    Date of invention, etc., 111
    Forms and proportions of several parts of, 111
    Names of various parts, 112

  Cylinder lips, proper shape of, 124

  D

  Dead-beat escapement, 131, 135
    Only one true, 112

  Depth, between cylinder and escape wheel, 129
    Effect of changing, 176

  Designing a double roller, 77

  Detached escapement, 155

  Detent, functions of the, 137

  Detent escapement, 131, 155
    Faults in, 132

  Detent spring dimensions, 138

  Detent springs, width of, 147

  Discharging jewel, setting the, 142

  Discharging roller, 136

  Dividers, 9
    Making, 10

  Double pendulum, 160

  Double-roller escapement, 75

  Draw defined, 85

  Drawing-board, 11

  Drawing instruments, 9

  Drawings, advantage of large, 29

  Drop and draw, 150

  Duplex escapement, 131, 155

  E

  Elasticity of spring, 133

  Engaging friction, 81

  English recoil anchor, 167

  Entrance lip of cylinder escapement, 125

  Escapement angles, measuring, 101

  Escapement error, study of, 64

  Escapement matching tool, 106

  Escapement model, 40
    Balance, 42
    Balance staff, 44
    Bridges, 41, 42
    Escape wheel, 43
    Extra balance cock, 45
    “Frosting”, 46
    Hairspring, 42
    Jewel for, 43
    Lower plate, 41
    Main plate, 41
    Movement for, 41
    Pallet staff, 42
    Pillars, 43
    Regulator, 46
    Uses of, 44
    Wood base for, 41

  Escapements compared, 103

  Escapement of Dutertre, 160

  Escape-wheel action, 30

  Escape-wheel, delineating an, 11