. The Cuba review. Cuba -- Periodicals. Fig. 1.—Method of placing lightning rods on a building having no cupola or chimney. Length of building, about 25 feet. FIGURE I. La figura i muestra un edificio de 25 pies de largo protegido de las descargas electricas por medio de pararrayos. Para un edificio de esta clase, et alambre galvanizado No. 3 es suficiente; para un edificio de 56 pies de largo se requiere el alambre No. 4. En esta figura se muestra un alambre extendido a todo lo largo del tejado, con una inclinacion de 20 pulgadas a cada lado, con otro alambre del mismo tamafio en el centro. L
. The Cuba review. Cuba -- Periodicals. Fig. 1.—Method of placing lightning rods on a building having no cupola or chimney. Length of building, about 25 feet. FIGURE I. La figura i muestra un edificio de 25 pies de largo protegido de las descargas electricas por medio de pararrayos. Para un edificio de esta clase, et alambre galvanizado No. 3 es suficiente; para un edificio de 56 pies de largo se requiere el alambre No. 4. En esta figura se muestra un alambre extendido a todo lo largo del tejado, con una inclinacion de 20 pulgadas a cada lado, con otro alambre del mismo tamafio en el centro. Las conexiones, segun se muestra, estan colocadas a cada lado del tejado y los extremos entran en el terreno. Esta es la manera de colocar los alambres en un edificio sin cupula 6 chimenea. FIGURE 2. La figura 2 muestra la clase de empalmes gal- vanizados que se usan para afianzar el alambre al edificio. wire must be galvanized or even doubly galvanized. The ordinary telegraph wire has a diameter of about fifteen one-hun- dredths of an inch, it is often struck by lightning, yet it is seldom fused. It is probable that although a light iron wire may be melted it will have served its purpose before being destroyed. No. 3 wire is about twice the size of telegraph wire (No. 9), and the writer does not know of a case wherein that size has been fused by a light- ning discharge, and therefore feels no hesi- tancy in recommending its use as a light- ning conductor for isolated buildings of moderate height. The T connections are shown in figure 2. They should be galvanized. Directions for Putting Up Wires, The conducting system is composed of a horizontal wire following the ridge of the roof, and two vertical wires connecting with the ground on both sides of the building. (See illustration No. 1.) The wires should be fastened to the building by galvanized iron staples about an inch long, or by means of small wooden blocks with screw eyes, 10 feet apart. The wire can be easily passed thr
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