hanged after putting in a new cylinder; if
such is the case, however, move the chariot--we mean the cock attached
to the lower plate. Do not attempt to change the depth by manipulating
the balance cock. Fig. 183 shows, at _h h_, the form of chip taken out
by the tool _o o'_, Fig. 182.

INDEX

A

Acid frosting, 46

"Action" drawings, 90

Action of a chronometer escapement, 142

Acting surface of entrance lip, 127

Actions of cylinder escapement, 112

Adhesion of parallel surfaces, 94

Adjustable pallets, 98

Adjusting screw for drawing instruments, 21

Analysis of principles involved in detent, 137

Analysis of the action of a lever escapement, 86

Angle-measuring device, 68

Angular extent of shell of cylinder, 122

Angular motion, drawing an escapement to show, 91
How measured, 69
Of escape wheel, 37

Antagonistic influences, 133

Arc of degrees, 9

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 def