Why Do We Wear Engagement Rings?

The modern Western practice of giving or breaking engagement rings is traditionally thought to have begon in 1477 when Maximilian I, Holy Roman Emperor, wave Mary of Burgundy a diamond ring as an engagement present.

Customs for engagement rings vary according to time, place, and culture. An engagement ring has historically been uncommon, and when such a gift was given, it was separate from the wedding ring. Romantic rings from the time of the Roman Empire and from as far back as 4 AD often clash the Celtic Claddagh symbol (two hands clasping a heart) and so it is thought that this was used as some symbol of love and commitment between two people.

In the United States, United Kingdom, Ireland, Canada, Australia, and many other countries, an engagement ring is worn on the fourth finger of the left hand. The tradition of wearing a ring for engagement originated from the Egyptians who believed the circle was a bond between the two people who were to be married, but was initially first practiced on the fourth finger / ring finger by the Romans, who recognized this finger to Be the beginning of the vena amoris ("vein of love"), the vein that leads to the heart. The custom in Continental Europe and other countries is to wear it on the right hand; one historical exception arose in monarchical regimes, in which a nobleman entering into morganatic marriage (a marriage in which the person, usually the woman, of lower rank stayed at the same rank instead of rising ranks) would present his left hand to receive the ring (hence the alternative term "left-handed marriage").

In other countries like Argentina, men and women each wear a ring similar to wedding bands. They are made of silver when manifesting an informal "boyfriend-girlfriend" relationship. The gold band is given to the bride when the commitment is formal and the optional diamond ring is reserved for the wedding ceremony when the groom gives it to the bride. The gold band that the groom wore during the engagement – or a new one, as some men choose not to wear them during engagement – is then given to the groom by the bride; and the bride receives both the original gold band and the new diamond at the ceremony. The bride's diamond ring is worn on top of the engagement band at the wedding and thereafter, especially at formal occasions or parties. At the wedding, the rings are swapped from the right to the left hand. In Brazil, they are always made of gold, and there is no tradition for the engagement ring. Both men and women wear the wedding band on their right hand while engaged, and, after they marry, they shift the rings to their left hands. In Nordic countries such as Finland and Norway, both men and women wear an engagement ring.

Some women's wedding rings are made into two separate pieces. One part is given to her to wear as an engagement ring when she accepts the marriage proposal and the other during the wedding ceremony.

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How Rigs for Water Wells Operate

To find new artesian wells, technology absolutely has to help us. With technical and mechanical innovations together with hydraulic engineering it has been possible to build rigs that are more and more efficient and are able to go to very important depths while drilling even more resistant layers of rocks. An artesian well is an under earth rich reserve of pluvial water: it is about natural resources that are hidden in the earth’s ground, the precious water supply of an area can be more or less extensive. The drilled hole of an artesian well lets water spontaneously come up to surface, without the use of submersible pumps. To find this underground water it is thought necessary to use a rig that is appropriate to our aim. Modern rigs, designed and realized by companies from this sector, are able to drill into the layers of the earth for many hundreds of meters. We are talking about mobile rigs, i.e. mounted on trucks or trailer either big or small depending upon the dimensions and weight of the equipment; this will let us move the rig inside the working yard without too many problems.

The choice of the correct rig to drill water wells is a choice of fundamental importance. Depending upon the well’s depth the rig will need to be more or less powerful. The best way to find the most appropriate rig is to trust and search the internet. You just need to open the browser on Google or Bing pages and type “drilling rigs for sale”. Over the world there are many companies that are operating in the sector of designing and realizing rigs. There are companies that are specialized in building rigs dedicated to water research. Others do have rigs to drill inside mines. Others specialize in oil exploration in the deepest layers of the earth from either marine platforms or on the mainland. There are also bigger companies that offer a wider range of drilling equipment. It is not always necessary to buy a new drilling rig. Most companies suggest and offer to their clients the option to hire and sell used rigs which can be recommended for small works when it’s not necessary to use equipment for a long period.

It is possible to find rigs that are fit for any purpose; it is though important to know that not all rigs are equal. For instance there are mechanical rigs which normally operate by diesel engines. There are electrical drilling rigs powered by energy sources generated in the work place, often they have engines with internal combustion. There are hydraulic drilling rigs that are using hydraulic oil flow operated by diesel engine. The system includes one gear box on which are connected different hydraulic pumps. Moreover modern rigs do differentiate themselves for their drilling method; these rigs can work a percussion system or rotary drilling method. The first ones impact the ground vertically drilling a large diameter hole in the ground; these rigs are mostly used when searching for water at low depths, but with very large diameter. Other types of drilling rigs instead, operate by rotating movement with a specific tool, normally called a bit.

Cordless Impact Wrench Designs and Information

What is a Cordless Impact Wrench?

A cordless impact wrench is most usually a battery powered tool designed to tighten a nut or other fixing, although other varieties do exist. An impact wrench works by using a motor to spin a mass inside the tool called a hammer. The hammer stores energy which is rapidly transferred to the drive shaft of the tool, which is called the anvil. The power transfer occurs very fast and is deliberately intermittent. Peak torque can be very high, but as this transfer process only occurs for a short period of time very little of the energy makes its way back to the tools operator.

What Designs are Available?

The usual design for a light industrial cordless impact wrench is very similar to that used in automotive designs. That is to say that it is a small torque gun style of product. The difference between a battery powered tool and one powered by compressed air comes from the fact that the power comes from a batter inserted into the base of the handle, rather than a compressed air line.

These pistol style impact wrenches are the more powerful of the cordless designs available, but for jobs where access is limited they can be too bulky to use and so another format is required.

Angle head cordless impact wrenches are used where there is a desire for mobility and increased flexibility of use. A typical tool in this class can offer a number of head positions, not just 90 degrees and so can be used in a variety of positions as demanded by the work environment.

What are the Advantages of a Cordless Impact Wrench?

Cordless power tools are generally less powerful that their corded cousins, there is no denying it, but the gain in flexibility of use is great. If work is to occur at a distance from a power source then a cordless tool is a huge help as all that is required is a few batteries and work can continue with minimal disruption.

Cordless impact wrenches are also safer in the workplace as they leave no dangling cables to trip over.

Angle head tools are designed for ease of use in tight working environments and generally come with their own LED lights as natural light is often restricted in these cramped environments. While these tools lack the power of more conventional pistol grip designs they do have exception reach due to their elongated design and narrow heads. The can be excellent additions to an automotive workshop for this reason alone.

While cordless impact wrenches will never replace heavier industrial units in terms of power there is no doubt that they do offer increased flexibility of working. Surely any workplace that values safety of the workforce should consider replacing old cabled tools with a safer alternative that is a cordless impact wrench?

Technology in Sports

It today’s world, sport cannot go together without technology. With the ever growing development of new technologies, they have always tried to be implemented into sports. Because technology can give sports something nothing else can, an unmistakable truth. Or so they say. Due to the fact that people are, well, people, they are bound to make mistakes. It is because we are human, we are not robots, that we can make mistakes, while robots make them only if they are malfunctioning. This is especially emphasized in sports, where human eyes can often deceive their owners, the referees most importantly, but also players, coaches and the fans. That is why these days there are many discussions about installing video technology into sports, mostly football. What does technology actually mean for sports?

Here I would like to emphasize that there are already sports using technology, like tennis and cricket, to name some. It helped the referees a lot, to minimize and correct some mistakes they make. But apparently, not all problems are solved like this. Players that have been playing for a longer period of time, and have not grown up with these kinds of technologies, are not convinced that it works properly. This suspicion is probably understandable, because when they were first starting their professional sports careers, they did not probably even dream about something like this would exist. But this technology has been tested time after time, and skeptical players, such as Roger Federer, have learned to live with it and accept it, although probably not so reluctantly.

This technology used in sports is called Hawk-Eye line-calling system, or just Hawk-eye for short. It was invented by a British computer expert Paul Hawkins. It is now used in tennis, where six or more cameras, situated around the court are linked together, track the path of the ball. Then those six or more cameras combine their separate views and make a 3D representation of the path of the ball. For tennis, or basically any other sport, this means that any close line call can be checked, quickly and accurately. This is not always used on tennis tournaments, though. For instance, the French Open is not using this technology because the tournament is played on clay courts and thus the print of the ball on the ground can easily be seen. Maybe this will change one day, because you can’t always be 100% sure you are looking at the right print.

These days there have been a lot of talks about introducing this technology to the sport of football. The sympathizers of this idea have been especially loud after the South Africa FIFA World Cup 2010, where a lot of mistakes by the referees have been made (an Argentina goal allowed although the player was offside, England goal not seen in a crucial moment). However, referees are only human, and they are bound to make mistakes because they can not help it, so i do not think all those critics were fair to them. On the other hand, a recent statement was made from the UEFA president Michel Platini, who is not thrilled about the goal-line technology, saying that this would reduce football to a video game. I don’t believe that other sports who have this technology have been reduced to a video game. Furthermore, he also admits that referees can make mistakes and that there are many cameras on the field that can catch any disputable moment. So why not help football, or any other sport, to see these disputable moments clearly and to resolve them without making mistakes. Or is it better to hear a mass of critics every time something like this happens? I am sure the referees would like this kind of help, then they couldn’t be blamed for anything and wouldn’t have to listen to all the nonsense people say about them the other day, or worse.