How to prevent enemy attacks on the top of the tower, how to protect the sides, how to fix the ladder, whether to drill the round holes for fixing the wheels on the bottom plate first or later, and how to ensure that the bottoms of the six wheels are on the same plane. Roman siege towers are usually only a dozen or twenty meters high, with soaked animal skins and iron sheets on the outside to prevent fire. A drawbridge is installed on the top floor for soldiers to climb the city wall, and there is a siege hammer on the bottom floor to bombard the foundation of the city wall. The function is very practical. When making, you need to consider the order and measurement accuracy, how to make each layer consistent in height, the level of the beam, and the details need to be reinforced with round wood wedges in addition to bonding.

The shapes of grass houses in different tribes in Africa are different. They are made of local natural materials. As the number of family members increases, the structure and appearance of the grass house also change. The natural environment of the dry season and rainy season also has a direct impact on the function of the grass house.

The shapes of grass houses in different tribes in Africa are different. They are made of local natural materials. As the number of family members increases, the structure and appearance of the grass house also change. The natural environment of the dry season and rainy season also has a direct impact on the function of the grass house.

What is the principle of Fresnel lens? For ships sailing on the sea, seeing a lighthouse means safety and hope. Lighthouses are landmarks on the sea. The ancient Egyptians built the earliest Alexandria Lighthouse 2,300 years ago, using firewood to light a fire to indicate the direction. The Eddystone Lighthouse in southern England was destroyed and rebuilt four times and became the most tormented lighthouse. The longest-serving lighthouse is the Hook Point Lighthouse on the Hook Peninsula in Ireland. There is also the loneliest lighthouse on the rock pillar in Iceland. Lighthouses in different places tell countless historical stories. The characteristics of lighthouses are bright colors, high enough, and the light shines far enough.

Traditional amusement parks are ancient Roman baths, markets and simple entertainment activities, as well as mazes and swings in the private areas of Italian and French nobles. Modern amusement parks were formed in Europe and the United States in the 19th century. Tivoli Park in Copenhagen is the inspiration for Disneyland. Ferris wheels, roller coasters, water worlds, bungee jumping, pendulums, trains, pirate ships, etc.

Why are the houses in Jiangnan so clustered together? Why are the roofs so high? How are the raised-beam roof structures of Jiangnan houses constructed? Why are blue bricks and black tiles used instead of red bricks?

Hilton Hotel

Nursing Home

Solar House 2