The minimum focusing ability is very useful in certain disciplines such as ornithology (bird watching) and even entomology (insect observation) and others, it allows us to clearly focus on animals (birds, butterflies, dragonflies, amphibians and reptiles, etc. ) a short distance, watching them in detail. The so-called "focus to infinity" also should be checked. This ideal is to focus a distant object straight silhouette (an antenna or pole is ideal) and check the result: a prism of a certain quality you see a clear image in a bad double image. Some models of binoculars on the market (eg STEINER.) Lack of focus ring, as they are made to provide insight clear at any distance from a minimum distance (around 10 to 20 meters). These models are very useful in applications for water sports, hunting, and the observation that in general do not require a vision at close range, but are inappropriate for others, especially ornithology (bird watching), which are often seen very close detail . As a complement to the focus, the binoculars come equipped with a diopter corrector.
This mechanism may be located in the right eye or along the central cylinder of focus. Its mission is to correct the possible difference in vision between the eyes, to achieve a perfect image sharpness. The classic method of adjustment is to focus an object (newspaper or billboard ideal commercial) with the left eye, moving the focus ring, and then with the right eye and moving the diopter adjustment sharp focus the image.
In addition to power flow routes are divided by type of thresholds – obstacles that are overcome on the ship. Oversea Wikipedia gives six shades of obstacles: level 1 (easiest). Small obstacles. Must the minimum possible maneuvers. Level 2 (easy).
There are small rocks, requiring for their passage of simple maneuvers. Level 3 (complex). Already a lot of foam, a lot of obstacles to the passage of which requires certain skills. At this level, there are complex phenomena such as "barrels". Level 4 (very difficult). In fact, with this level begin the most inexpressible feeling, because these routes are unpredictable. C first time it is unclear how they perform.
Need a lot of maneuvering. Level 5 (extremely difficult). These sites are already pose a risk to life. They present many very dangerous obstacles in the which a person can drown, to be entrained in eddies, "drums" and so on. Level 6 (practically impassable). Their subjugation and solved a few injuries and even death for such sites are common. Often only on the sixth level of complexity do not speak because he is guaranteed to be deadly, and even in competition for rafting such sites are not considered. This kind of extreme sports are so popular that now there is an international federation of white-water rafting. Its offices are located in 47 countries. Among them are Russia, Ukraine, Turkey, Georgia, usa, and many others. Regularly in different countries, conducted training courses and can be argued that the process of training is conducted in a professional manner. Commercial rafting Probably the best and safest way to begin development of the sport, is to participate in the so-called Commercial rafting. In general, it will be convenient for those who have never rafted in this way (or even any other), but wants to get his share of fantastic sensations. Almost all the work related to the analysis situation and decision, for you doing the instructor. You have to just follow his instructions. Otherwise, you are threatening injuries. However, previously, before a final decision, your task is to correct choice of an organization providing similar services. On the quality of equipment, selection of experienced instructors, route selection depends on your life. It should also be aware that this extreme sport is not entertainment, akin to roller coaster. It is very important: – the ability to work together – the unquestioning compliance and team of instructors – compliance with safety regulations. "Back on the raft will not work. Actually, this kind of a small imitation of our lives with whirlpools, rocks, unseen obstacles, rapids and calm sections. In addition to the alloys only members can also memorable natural environment, recreational campfire, fresh air and just lots of fun. Perhaps this is the most important skills that you learn, rafting on the rafts.
Increasingly, instead of all the usual mixture of sand and cement, which is prepared immediately before dosing and which are "by eye", the builders began to use it dry mixes, produced in industrial conditions. The benefits and advantages does the use of dry mixes in the building: saving time and place – eliminating the need for acquisition, storage and blending of all components in the composite Ability to produce the proportions of a mixture of any complexity on order – due to flexibility of the production process for process equipment in Europe No loss of quality – a solution can be prepared in necessary at this point amounts Saving transportation costs – the use of dry mixes eliminates constant supply to the building site ready solution, which drastically reduces transportation costs Guarantee high quality – the right recipe at the expense of accurate dosage of components (quality of ready-mix compares to cooked on the spot) What is a dry mix? Current dry mixes it – multicomponent formulations, which in addition to the mineral binder and filler present complex chemical additives regulating the speed of setting and hardening binders, and provide the necessary physical and mechanical properties of the solution after solidification. The most commonly referred to as dry mixes simple sand-cement mixture (sometimes they add lime, ground limestone, ash, thermal power plants) marks 100 and 150, put up in Kraft bags and used for masonry and plastering work. In such mixtures, using screened out of coarse grains and dried sand, which provides long-term storage and simplifies the preparation of mortar. But in modern sense of the term "dry blend" to such free-flowing compositions can be applied fairly conventional. Composition of dry mixes in any of the dry mixture includes: binder (cement, gypsum and lime or combination), neutral fillers to provide the optimum amount (usually a sand), and special modifying additives, which give the necessary properties of the mixture.