Note the open wiring extending down to the fire call box which I think is pretty unusual. Typically, such wiring in the early days was via paired wires that led down the side of the pole to the call box. Like most other communities at the time, fire alarm circuits were strung along the top of utility poles. Stringing them beneath telephone and electric wires could possibly interfere with call box communication if one or more of the lines of other utilities fell upon them. Immediate fire reporting was a very important and critical issue as it still is. Otherwise interrupted/broken call box reporting wires could lead to serious loss of life and property. By the around 1920 electric utilities began to standardize and strengthen their plant retiring weakened lines, poles, crossarms, etc., while lead-sheathed paired aerial cable with telephone companies was gaining popularity. Thus, it became usual and safe in mounting fire alarm crossarms and wire lower on utility poles, typically between the electric utility plant and communication companies' equipment and wiring.