Then Barrett discovered a method of twisting fifty pairs of wires — since grown to 2400 pairs-into a cable, wrapping them in paper and molding them in lead, and the wires were now taken from poles and placed in conduits underground.

然后 Barrett 发现了一种方法，将 50 对电线（后来增加到 2400 对）拧成一根电缆，用纸包起来，用铅浇铸成型，现在电线从电线杆上取下来，放在地下的管道中。