The Portland Company created this detailed drawing for the U.S. Light House Engineers Office in Portland regarding updates to the Portland Head Light Lantern. Specific details on this plan include fastenings for the watch room door, a ventilator for the lantern, a sash bar for the second order lantern, a plan of roof segment for the lantern, a watch room ventilator hood, a door frame for the watch room, and hinges for watch room door.