In 1874 he invented and sold to Western Union a system by which four messages could be sent over one wire at the same time, two in each direction.
2
西岱尔专家认为，如果要完全消除配电线路的雷电事故，必须每基杆塔的每相都要安装过电压保护器。
West glendale experts believe that if you want to completely eliminate the distribution line lightning accident, must be installed each tower the every phase of over-voltage protector.
3
这些发明，仅在电线和电线竿的成本上就为西联电讯公司节约了几百万美元。
These inventions saved Western Union millions of dollars in the cost of wires and telegraph poles alone.
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