This listing is for three vintage wooden rolling/parallel rulers made of a heavy ebony, possibly crafted sometime during the Victorian period.  The longer one is approximately 1" wide by 15" long.  The middle sized ruler measures approximately 1" wide by 12" long.  (This one seems to be made of a lighter wood...)  The shorter one measures approximately 3/4" wide by 9" long.  Both are in excellent working condition and would be a unique addition to any draftsman collection.  Please see pictures for details or message me directly with any questions.