Early New England-style telephone open-wire construction is seen along the left. These 6-pin arms were among the first that Ma Bell used for local service. Many had two diagional bolt holes for pole attachment via lag screws. These crossarms also employed braces. I would estimate that this type of construction was first used by Ma Bell around 1890. This method was replaced by employing 10-pin crossarms starting around 1910, particularly during pole changeovers. These arms had a typical, single bolt hole for securing to the pole along with 28 or 30 inch braces, almost always mounted outside the crossarm. The additional pins provided extra space for adding subscriber circuits. On the right is some electrical distribution typical of the day (early teens).