types:
atomic clock
a timepiece that derives its time scale from the vibration of atoms or molecules
clock
a timepiece that shows the time of day
sandglass
timepiece in which the passage of time is indicated by the flow of sand from one transparent container to another through a narrow passage
sundial
timepiece that indicates the daylight hours by the shadow that the gnomon casts on a calibrated dial
timer
a timepiece that measures a time interval and signals its end
ammonia clock
an atomic clock based on vibrational frequency of the nitrogen atom in the ammonia molecule
analog clock
a clock that displays the time of day by the position of hands on a dial
analog watch
a watch that represents time by the position of hands on a dial
caesium clock
an atomic clock based on the energy difference between two states of the caesium nucleus in a magnetic field
chronograph
a device for recording time with great precision
chronometer
an accurate clock (especially used in navigation)
cuckoo clock
clock that announces the hours with a sound like the call of the cuckoo
egg timer
a sandglass that runs for three minutes; used to time the boiling of eggs
hourglass
a sandglass that runs for sixty minutes
parking meter
a coin-operated timer located next to a parking space; depositing money into it entitles you to park your car there for a specified length of time
pendulum watch
(18th century) a watch with a balance wheel having a fake pendulum attached to it
pocket watch
a watch that is carried in a small watch pocket
stem-winder
a watch that is wound by turning a knob at the stem
stop watch,
stopwatch
a timepiece that can be started or stopped for exact timing (as of a race)
time clock
clock used to record the hours that people work
turret clock
a clock with more than one dial to show the time in all directions from a tower