The Evolution Of The Clock.

The Pendulum

The water clock

The hourglass

• It was invented in 1656 A.D. by Christian Huygens who was scientist and an inventor.
• This clock uses a pendulum. The advantage of this pendulum is that it's a harmonic oscillator; it swings back and forth in a precise time interval depending on is length.

• It's made with sand and glass, and you have to turn it to make it work.
• It existed prior to the water clock, which is known to have existed in Babylon and Egypt as early as the XVI century B.C.
• This clock needs to be carefully calibrated.
• There are many factors that contribute to an hourglass ability to accurately measure time: the type and the quality of the sand, the flow velocity and the radius between the width of the neck and the diameter of the sand particles.

• The first water clocks that existed were in Babylon, China, India and in Egypt in 4000B.C.
• A water clock uses a flow of water to measure time.
• There are two types of water clocks:

The outflow clock: the water is drained slowly and evenly out of the container. This container has marks that are used to show the passage of the time. As the water leaves the container, you can see where the water level is in relation to the lines and tell how much time has passed.

And the inflow clock: it works in the same way, except that it is the clock that fills the container with water.

The sundial.

Introduction

The clock is an instrument for telling the time.

• Nobody knows for sure who invented the sundial, but it is believed it was invented by the Egyptians, Greeks, Romans or Babylonians in 1500B.C.
• The sundial was discovered in Egypt.
• This clock works by putting a stick in the ground and then by looking at the shadow you can see roughly the time.

How did people tell the time before the clocks were invented?

People started to know the time "reading"the natural elements of their surrounding: the moon and sun faces, the changes of the seasons, the movements of the celestial bodies and by the presence of day and night.

The atomic clock

Pocket watch

Wristwatches

The evolution of the clock.

• It was invented in 1930s by Isidor Rabi.
• It is the most efficient clock that has existed in the world, only each 300 years this clock can go ahead or behind.
• Atomic clocks are far more precise than conventional clocks because atomic oscillations have a much higher frequency and are much more stable.

• They were invented on the 19th March 1952 by Elgin National Watch Company and LIP (that are laboratories).
• These type of watches are the same as the pocket watches, but the only differences are that they can be electronic and they are made to be worn on wrists.

With the time people wanted to know more exactly the time and how long they spent doing their things, so they started inventing things to know it more exactly. From here, the clocks have started its evolution.

• It is a watch that is made to be carried in a pocket, as opposed to a wristwatch, which was created to be worn on the wrist.
• It was created in the XVI century until wristwatches became popular after World War I.
• We say that they are automatic watches because they are made with gears (I mean, they are mechanical).
• The only bad thing that they have is that they aren't very precise.

The Evolution Of The Clock.