防雷保护。
俄亥俄州俄亥俄州的州火马歇尔H. D. Davis致力于审议对抗闪电保护的主题。他已经体现了他的调查，如下所示：标准杆。 - 抵御闪电的保护是孤立的建筑物，以及拥有高烟囱，尖顶，高峰或山墙屋顶或旗杆的所有建筑物。每单位屋顶区域建议使用具有适当空气和地球端子的“杆”，如下：金属屋顶，每个2,000平方英尺的地面面积;金属以外的屋顶，每个5000平方英尺的地面区域;金属屋顶，每个5000平方英尺的地面区域。空中端子不应超过五十英尺，每个距离都应有其各个地面。低宽阔的面积大于七十左右的大脚，最好通过建筑物的中心受到额外杆的额外保护。空气端子 - 空气端子将放置在RxIF或结构的最高点，其中有两个或更多个Gable，或者在屋顶上方的其他突起，几乎相等的高度，每个凸起几乎相同，每个凸起几乎相同并且所有人都连接在一起。树木矗立在那里靠近分支悬垂的建筑物，或者非常接近屋顶，导体，带有适当的地球码头，沿着每棵树的躯干延伸到靠近围绕分支或后备箱的波特固定的瓷砖最高分支顶部，并配备了一群点。导体。 Conductors to be put in sheet or tape form of either copper, weight not less than six ounces per foot, or iron weighing not less than two and one-quarter pounds per foot, the latter to be painted or galvanised to prevent corrosion. One-inch iron rod can be used to connect iron ground witli copper conductor, the conductor terminating above the surface of the ground. Air-terminals to be rods of iron or copper, not less than tnrec-quarter-inch in diameter, with point cone-shaped and height of cone equal to the radius of the base. One foot below the point there should be a casting holding four copper points. Large chimneys should have a band of iron or copper, not smaller than the conductor, round the top six incites below the corbeling, and provided with copper points a foot long and one-half an inch in diameter. Terminals can be satisfactorily made of three-quarter inch copper or iron pipe. Joints. All joints to be made mechanically and electrically secure and then soldered. To be run down side of building where best ground is obtainable, preferably on the side most exposed to rain. Not to be run nearer than five feet to interior piping, unless absolutely unavoidable. To be run as straight as possible, avoiding all turns of radius of less than one foot, and to incline downwards throughout its entire course. Should never be insulated, but fastened securely to the surface. Must never be run through iron pipes. Connections.—Connections to be made with iron piping or castings, to be made by screwing a brass plug into same and fastening conductor securely to it, then soldering. Or, with copper ground, by riveting and soldering, the connection then being coated witti asphaltmn paint. A copper plate not less than two feet by three feet by one-sixteenth-inch buried in permanently damp earth not less than four feet below the surface, with three inches of crushed coke or charcoal underneath, and the same material above to w ithin six inches of the surface of the ground. Or. an iron casting so shaped as to have a number of pockets or cups facing upwards. Should have not less than six square feet of surface. Should be buried with not less than six inches of scrap metal and coke under and six inches over same. A proper ground is absolutely essential and permanently damp earth is absolutely required.
Canisteo，N. Y ..是诉诸于Hornellsville，N. Y.的诉讼，据称被排放到河流中的污水的服务员供应。
