A fire alarm telegraph circuit ran along the two-pin crossarm line atop the pole on the left. Beneath were telephone open wire circuits serving local subscribers. And aside most of this were electric lighting service lines. The latter often carried high voltages and in the earliest days of electric distribution in communities across the US and Canada it was commonplace to string such wires lowermost upon poles (often on separate ones, like we see here). This helped to prevent their dangerous high currents from falling into adjacent comms and fire alarm wires. By the teens a lot of this had changed since some communities placed their utilities underground. They were also made safer by then-new electric utility overhead construction practices and equipment and via covered paired telephone cable replacing the former bare open wire.