ANTIMAGNETIC

Protected against the effects of magnetic fields, which can affect a movement’s precision by influencing the balance’s rate of oscillation.

One way to protect against magnetism is to make the balance and balance spring of metals that either cannot be magnetized or are resistant to becoming magnetized (e.g., Elinvar or Nivarox hairsprings used in conjunction with brass, nickel or beryllium bronze balances). Other delicate components, specifically the lever, escape wheel and impulse roller, can also be made of nonmagnetic metals.

Another way to protect against magnetism is to enclose the entire movement in a case made from a highly conductive alloy, which prevents magnetic fields from building up inside it. A watch can be described as antimagnetic if, within a magnetic field of 4,800 A/m (amperes per meter), it continues to run with a deviation of no more than 30 seconds per day. One symptom that suggests that a watch has been magnetized is a tendency to run slow.

A magnetized watch can be “cured” (i.e., demagnetized) by a watch repairer using a choking coil. APERTURE A small, often rectangular opening in the dial. Various indications such as date, month, day or hours are displayed through these openings.

Clock & Watch Encyclopedia

A

A/h or ALTERATIONS (or ALTERNANCE) PER HOUR
AMPLITUDE
ANA-DIGI
ANALOG
ANCHOR ESCAPEMENT
ANGLAGE
ANNUAL CALENDAR
ANTIMAGNETIC
APPLIED INDICES
AUTOMATIC MOVEMENT

B

BALANCE
BREGUET OVERCOIL HAIRSPRING

C

CALENDER
CALIBER
CHAPTER RING
CHARGE INDICATOR
CHRONOGRAPH
CHRONOMETER
COLUMN WHEEL
COMPLICATION
COSC (OR C.O.S.C.)
CROWN
CRYSTAL

D

DIAL
DIGITAL
DISPLAY

E

EIGHT-DAY MOVEMENT
ELECTRONIC
EQUATION OF TIME
ESCAPEMENT

F

FINE ADJUSTMENT
FLYBACK CHRONOGRAPH
FREQUENCY
FUNCTION

G

GENEVA SEAL
GENEVA WAVES
GMT
GRANDE COMPLICATION
GUILLOCHE

H

HACK, HACKING SECONDS
HAIRSPRING
HALLMARK
HAND-WOUND MOVEMENT
HOROLOGY

I

INCABLOC
INDEX

J

JEWELS

K

KARAT

L

LEVER ESCAPEMENT
LIGNE
LIMITED-EDITION WATCH

M

MAINSPRING
MANUAL-WIND MOVEMENT
MANUFACTURE
MECHANICAL WATCH
MICRO-ROTOR
MINUTE REPEATER
MOON-PHASE DISPLAY
MOTION WORK
MOVEMENT

O

OSCILLATION

P

PALLET
PERLAGE
PERPETUAL CALENDAR
PERPETUAL DAY/DATE
PLATE
POWER RESERVE
POWER-RESERVE INDICATOR

Q

QUARTZ WATCH

R

RADIO-CONTROLLED
RATTRAPANTE
REGULATION
REPEATER
RETROGRADE DISPLAY
ROTATING BEZEL
ROTOR

S

SCALE
SCREW-DOWN CROWN
SELF-COMPENSATING HAIRSPRING
SHOCK ABSORPTION
SKELETONIZED MOVEMENT
STOP-SECONDS FUNCTION
SUBSIDIARY DIAL
SWISS MADE

T

TANTALUM
TITANIUM
TACHYMETER
TOURBILLON
TRIPLE DATE
TRITIUM

V

VIBRATION or VPH

W

WATER-RESISTANT
WHEEL TRAIN
WORLD TIME WATCH