Tihomir Čuljak
Sailboats are vessels or boats powered by power wind. In the past, they were the most common type of vessel, while today they are used most on recreational yachts and sports vessels, but more recently...
Ships have been using wind power for hundreds of years. After the invention of the steam engine, and later the internal combustion engine, wind power was used only for sport and family sailboats. Deve...
Snipers are rifles with an optical sight aimed at destroying enemies over long distances, and can also be used for hunting. Snipers are used by specially trained soldiers, snipers trained to observe e...
Many places around the world are planning to build floating tunnels. These are tunnels placed in water at a certain depth below the surface, or at the bottom of the sea. Typically, such tunnels are in...
Skis are tools that people put on their feet to move through the snow more easily and faster. The sleds have the same function, but one can sit on them while someone else is pulling or pushing them. O...
The sails on today's sailing boats most often have a triangular shape. The surface of a triangular sail is twice smaller than a square sail of the same height and width. By placing square sails on...
Boats are intended for navigation, but sometimes they must go out to dry. Smaller vessels are brought out to dry when they are repaired, while larger vessels are brought to the docks for water extract...
Transport bags are used to carry a large amount of equipment, clothing or other material. They are used by travelers, hikers, and soldiers. Special military units sometimes carry up to 70 kilograms of...
Shepherds are people who have to go where sheep, goats, cattle and other animals they keep go. In this movement, they must spend days outside populated areas, moving through bushes, forests and karst....
Seafarers have long since begun to use lifejackets to given to crew in the event of a ship crash. Initially, these were rubber belts, and later, with the development of plastics, they would become muc...
In recent years, in many countries, they did raised gardens have emerged. In some greenhouses, vegetables are grown on more floors. In Israel, some farmers breed strawberries in a meter raised with la...
Obelisk is a large monolithic stone block with four pages narrowing to the top. At the top is a small pyramid covered with electrodes, which is a mixture of gold and silver. The obelis were placed in...
Aerosol bombs are weapons that have been used in the war for decades. These are bombs that expel explosive gas that is explozsion blown up after blasting and causes a strong explosion. Compared to th...
Many people in the world occasionally made the boats on which they set their sailing gardens. Such gardens are usually very expensive. Some primitive peoples living in swampy areas have also made floa...
Debarkation boats are military vehicles that serve to transfer soldiers to an enemy territory. Disembarkation is carried out on the coasts of the sea or in the rivers, and in places not foreseen for s...
Many people made a floating raft of plastic bottles. Empty plastic bottles are placed in nylon sacks, or nets. Wooden pallets are placed on this floating structure. This raft has a large load capacity...
Bunkers are military objects that protect against enemy fire, grenades and explosions. Their purpose is to protect people and equipment in the bunker. In World War II, the Germans had small mobile bun...
Extensive breeding of ducks and geese on fishponds requires little investment. The duck and the geese are kept on the water during the day, while closing at night in the canopies. Canopies can be on t...
When a boat moves through the water it has to overcome a certain water resistance. Part of the resistance is formed on the bow where the boat penetrates through the water. The second part of the resis...
The first cars on compressed air used in the 19th century, mostly in mines. Compressed air also powered trams and locomotives. Various pneumatic tools are also started today with compressed air. Compr...
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Tihomir Čuljak
