I do not have an exact date for this photo but I'm assuming some time around 1890-1900. You can clearly see how this arc light was reeled in for its periodic carbon rod replacements via a pulley mechanism that is mounted on top the fixture. The insulators on the top crossarm look like CD 127's on the right with possibly two CD 162's on the left of this same arm. Not sure about ID of any of the other insulators on the pole. Note that lag screws or bolts held the top crossarm in place without braces. Enjoy!