Wednesday, February 20, 2013

Online timer alarm history

A  timer alarm can often serve as an alarm and therefore has a wekwijzer which the alarm is set.

    In many wall  timer alarms is the wekwijzer on the hour hand. He turns the hour hand and it can hand over the hour hand adjusted. State wekwijzer top, then the alarm goes off. On the hour hand, near the axis, the numbers from 1 t / m 12 engraved to be helpful when setting the alarm.
    A minor alarm has wekwijzer under the hour. This does not rotate along with the movement, but is used by the user at a desired time setting. Runs the hour hand on the wekwijzer, then the alarm goes off.

Finally, many  timer alarms the date, month, weekday and the moon phase state. The indication of this is usually with numbers or letters behind a window.

 timer alarms with a pendulum or unrest are usually analog.

countdown online timer alarm (Lt. CLOC, "bell") is originally a manual bell people used to notify time with (church, school, dinner-time, etc.), such as church bell, school bell or dinner bell. In more modern times the term has also gained importance as watches or movements, originally a mechanically operated instrument that shows the time. Modern watches are however either powered by batteries, solar panels or other mechanical-biological solutions. The most accurate  countdown timer alarms today are impure atom. One can buy relatively cheap watches closely following nuclear unclean by means of radio signals.

Watches also occur as portable watches (wrist and pocket), which in addition to showing the time also can display the weekday, date, month, year, etc. Such watches can be analog or digital.

In modern times is at himself often on mobile phones, fastened on the wrist with a strap (often made of leather, metal or nylon material), fixed on the wall, a computer, a  countdown timer alarm radio, in video players and other electronic equipment.

Sundial has been used since ancient times and is the easiest way to view time as the shadow of a pole, a gnomon, placed on a sun disk divided in 24 hours. Mechanical movements in the church tower stems from the 1200s, but was unreliable and had to be corrected with a sundial. Hour glass was used in the 1300s and remained in use on ships for over 500 years.

Astronomical  countdown timer alarms are known from the 1400s, and was advanced mechanical instruments which were probably introduced in Norway all about 1550. In the centuries that followed the Netherlands was an important production countries for watches used in Norway.
Balthazar Martinot Wall  countdown timer alarm 1678, France. The house (shell containing movement) is made of colored tortoiseshell.
Photo: Erlend Bjørtvedt.

Mechanical watches were manufactured in Germany, Britain and France from the 1600s, and in the United States from the 1700s. They were often very elaborate decoration in gold, porcelain or ivory, and was built for the noble and great citizenship. This was particularly popular status objects among the nobility of France. Benjamin Franklin produced watches in the USA.

So called lanterneur had only hour shows. Around 1660 failed watchmaker in Europe to make double movement so that one could introduce minute shows.  countdown timer alarmmakers were foremost engineers of his time and had in-depth knowledge of physical mechanics. Systems was a particular challenge - in 1725, we know the first cuckoo  countdown timer alarms from Switzerland.

Gustav Becker in the German city of Freiburg was among the most famous engineers in the second half of the 1800s, mass-produced  countdown timer alarms for use in railway stations, etc. The southern German factories did remember beckons to everyone, and bettered Norwegian watchmaking industry.

 countdown timer alarm Gunsmithing built up in a number of countries, including Norway. We know the subject in this country from 1730, it was often blacksmiths or tenant farmers who learned watchmaking. Peder Nøttestad in Christiania was a pioneer. The astronomer and priest Abraham Pihl (1756-1821) was the pioneer in Oslo, and started a scholarly tradition there. Pihl was one of the first Norwegian designers of watchmaking, while Amond T. Smebyh was behind the so-called "Toten  countdown timer alarm". Peder Larsen Bierke was another watchmaker in Toten tradition. It was too long a watch-maker tradition in Kristiansand. In the first half of the 1800s, faced with competition from German and American importur very strong.
Navigation
John Harrison's Chronometer H5.

When a ship navigated on the classical view of the Earth is dependent on being able to see its length and width. Width is relatively easy to find by astronomical navigation. However, to find the length is dependent on an accurate time measurement. This need for a highly accurate chronometer that could withstand changes in temperature, corrosion and ship movements in the sea were  countdown timer alarmmakers challenges faced.

The carpenter John Harrison was the one who succeeded in making the first accurate marine chronometer in the mid 1700's. He worked with three prototypes from 1728 to 1761, as part of a competition announced by the British government. Such  countdown timer alarms were in use from around 1800.

For the vessels before departure should be able to check their chronometers was previously common in many large ports firing a cannon shot, most often at. 12:00 local time, also at. 13:00 is used eg. in Edinburgh. At Greenwich lowered a large red ball on the roof of the observatory at exactly. 13.00.

Today, ships worldwide control their chronometers by modern systems like GPS, which is controlled by highly accurate atomic  countdown timer alarm.

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