Time measurment
Lana Certa 8.a
Clock – human invention
• A clock or chronometer is a device that measures and displays time.
The clock is one of the oldest human inventions, meeting the need to
measure intervals of time shorter than the natural units such as the day,
the lunar month, and the year.
Sundial
• A sundial shows the time by
displaying the position of a
shadow on a (usually) flat
surface that has markings that
correspond to the hours.
Sundials were widely used in
ancient times.A well-constructed
sundial can measure local solar
time with reasonable accuracy,
within a minute or two.
Water clock
Water clocks, along with The bowl-shaped outflow is
sundials, are possibly the the simplest form of a water
Given their great antiquity,
oldest time-measuring clock and is known to have
where and when they first
instruments, with the only existed in Babylon and Egypt
existed is not known .
exception being the day- around the 16th century
counting tally stick. BC.
The first known geared clock was invented by the great mathematician,
physicist, and engineer Archimedes during the 3rd century BC. Archimedes
created his astronomical clock, which was also a cuckoo clock with birds
singing and moving every hour.
It is the first carillon clock as it plays music simultaneously with a person
blinking his eyes, surprised by the singing birds.
The Archimedes clock works with a system of four weights, counterweights,
and strings regulated by a system of floats in a water container with
siphons that regulate the automatic continuation of the clock.
Hourglass
• An hourglass is a device that is
still used today for imprecise time
measurement. it is composed of
two connected vessels, one of
which is filled with sand, which
flows from it through a narrow
opening into the other. the
narrower the opening, the longer
the interval.they were invented in
14th century.
Mechanical watch
• A mechanical watch is a watch that uses a clockwork mechanism
to measure the passage of time. A mechanical watch is driven by a
mainspring which must be wound either periodically by hand or via
a self-winding mechanism. A The escapement is what makes the
'ticking' sound which is heard in an operating mechanical watch.
Electrical watches
• Watches appeared in the 16th century. During most
of its history, the watch was a mechanical device,
driven by clockwork, powered by winding a
mainspring, and keeping time with an oscillating
balance wheel.In the 1960s the electronic quartz
watch was invented, which was powered by a
battery and kept time with a vibrating quartz crystal
.
Digital clocks
• Digital clocks are today's modern
clocks that we use every day
through our phones, computers,
etc. They were created in the
20th century and show the time
digitally, with numbers, for
example 12:08.
https://google.com
https://hr.m.wikipedia.org/wiki/Glavna_stranica
