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\"Empress Catherine the Great, Queen of Russia loved her country, especially the snowy winters. Giant ice slides meant daring drops and thrilling rides for all! But every spring, warm weather melted the snow and the slides. What could Catherine the Great do to ensure fun all year round? With some ingenuity and some royal thinking, Catherine the Great would create her greatest invention!\"--Provided by publisher.

(1) In the formula, N is the estimated annual number of lightning strokes on buildings (times /а), к is correction factor, and it is 1 in general; for buildings located near a river, lake, under a hillside or in a mountain with relatively small soil resistivity, at the ground water outcrop, at the top of a mountain, at the tuyere of a valley, etc. , as well as particularly humid buildings, it is 1.5 ; for buildings with brick and wood structure and metal roof and without grounding, it is 1.7; for isolated buildings on hilltops or in open fields , it is 2. 091 49 times/ a. According to the Design Code for Protection of Structures against Lightning ( GB 50057 - 2010) , in areas where lightning flash to earth is likely to occur, the following buildings shall be classified as the second type of lightning protection buildings: (1) national buildings for key cultural relics protection; (2) national halls, office buildings, large exhibition and expo buildings, large railway stations and airports ( not including open spaces and runways for aircraft parking) , state hotels, national archives, important water supply pump rooms in large cities and other particularly important buildings; (3) national computing center, international communication hubs and other buildings having great significance to the national economy; (4) national super and class A large gymnasiums ; (5) dangerous buildings where explosives and their products are manufactured, used or stored, and where the electrical sparks are not likely to cause an explosion or great damage and personal injury or death; @ buildings with explosive hazard sites in zone 1 or zone 21, where the electrical sparks are not likely to cause an explosion or great damage and personal injury or death; (7) buildings with explosive hazard sites in zone 2 or zone 22; (8) open steel closed gas tanks with explosion hazard; © ministerial, provincial office buildings and other important or densely populated public buildings with an expected number of lightning strokes greater than 0.05 times/а, as well as fire hazard places; ® residential buildings, office buildings, and other general civil buildings or general industrial buildings with an estimated number of lightning strokes greater than 0. According to the rolling ball method in appendix D of the Design Code for Protection of Structures against Lightning ( GB 50057 -2010):i] , the protection range of the air-termination system is determined ( Fig. 2). .. If the connection point is underground, the down-conductor system and the ground pole are welded with chemical heat release, so as to avoid the corrosion of the connection point. Because the ground bodies of two different metal materials are buried together in wet soil, the potential difference is usually measured between the two ground poles.