A Safe History of Locks Family Articles | May 4 Lions Kids Jersey , 2009 Modern day safes have only been around for a couple of hundred of years, but their locks have been around for thousands of years. Lets take a look at the history behind some of these ancient devices.
Though the actual history of safes may not be very long, the main component and perhaps one of the most important parts of a safe has been, and that is the lock. It is hard to say when locks were first invented because there is not always a written history Lions Youth Jersey , and because of the materials used when locks were made, there are not very many still around today. However, there is evidence that many different civilizations developed locks independently of each other, among them being the Egyptians Lions Womens Jersey , Greeks, Chinese and Romans. But one neat thing about old locks, is that they are the building blocks upon which today's technology has been built. The locks have evolved, but many of the principles are the same on a modern day safe.
The oldest known lock is credited to the ancient Egyptians and is about 4000 years old. It was discovered in Persia in 1842. This first lock uses the same pin tumbler system that is still used on many safe models today. The Egyptian lock had a wood crossbeam that was partially hollowed out Black Lions Jersey , and a vertical beam with metal tumblers that locked the two pieces together. It was unlocked using a large wooden spoon shaped key that was about 14" - 24" long with pegs sticking out of one end. There was actually a hole in the door which you had to stick your arm through with the key to access the tumblers. If the key was inserted correctly, the pegs on the key would line up with the tumblers allowing you to move the crossbeam and open the door. These locks were used on full size doors to protect strong rooms which were used for storing valuables, food or whatever needed safe guarding. So the same basic reasons you may have a safe today, just on a much larger scale.
We know that the Greeks had early locks because of a description by Homer in "The Odysseus" from around 800 B.C. It refers to someone getting a brass key to open a store room Lions Jersey Sale , it describes the the lock as follows: "She loosed the strap from the handle of the door, put in the key, and drove it straight home to shoot back the bolts that held the doors." Doors is plural because most Greek doors were two doors that opened from the center. These doors were typically tied together with a rope using intricate knots, and then the door was bolted from the inside. This type of lock was not very secure because after removing the rope Cheap Lions Jersey , a few attempts with a couple of different key designs often opened the door.
The Romans started with a similar design but improved it by using an iron case around the bolt work, making the bolt spring loaded and the use of wards. A ward lock uses a set of obstructions that stopped the lock from opening without the correct key, which would have corresponding notches to slide past the obstructions - this concept is still used today for many household doors. If you look at a skeleton key, you can tell from the notches the size and number of obstructions inside the lock. The Chinese are also credited with inventing the ward lock Lions Graham Glasgow Jersey , so it is one of those types of things with dual development in two different parts of the world. The ward lock also lent itself well to the first portable safe, often called strong boxes in mediaeval Europe.
Other than more complicated ward locks, there was not a huge development in security until the eighteenth century in England when incentives were offered to anyone who could develop an unpickable lock. We have seen huge improvement in locks, security and the development of the modern safe since then Lions AShawn Robinson Jersey , but even these improvements were founded upon the same basic principles as used in ancient times.
Article Tags: Locks Were, Ward Lock
The Most Common Part of Our Life: Injuries Health Articles | November 22, 2016
Damage is injuries to the body. Injury might be brought on by hits, weapons Lions Michael Roberts Jersey , falls, accidents, and different causes. Real injury will be harm that can possibly bring about prolonged disability or death.
Injuries are the most Common part of our life. It is our routine affair. We use to come across them in a regular fashion. They are hazardous for our health. They should be prevented in order to avoid their harmful effects on the human body. Now we will discuss the ways of preventing abrasions:
Knowledge About Weak Parts of The Body
We should be aware about the fact that which part of our body is weak and defective. If we are well known about the fact that our foot is weak or defective then we should not run and use stepper otherwise our foot will be injured which is not good for our health.
Guidance
Girls do work-out in gym for reducing their weight and boys do work-out in gym for building their body. During these work-outs if we do any exercise in a wrong manner, then we have to face wounds and damages. We should be guided by trainer to do the exercise in the right manner so as to protect our body from bleedings and lesions.
Age
The work-out depends on the age of the individual. If the person is young then he or she can do heavy exercises and it will be good to shape his or her body. If the person is old then he or she should do light exercises otherwise he or she has to face gashes which affects his or her bones or muscles harshly.
Metin2
Thema drucken
11.01.2020 04:48
Antworten
