(a) Philadelphia rod. Brass tip base, varnished wood, split slide ruler, with vernier scale impressed and painted. Unit has adjustable round metal target. Developed in late 18th century Philadelphia for long range and hillside surveys. Ultimate height of extended rod is one third higher than a stad…
(a) Philadelphia rod. Brass tip base, varnished wood, split slide ruler, with vernier scale impressed and painted. Unit has adjustable round metal target. Developed in late 18th century Philadelphia for long range and hillside surveys. Ultimate height of extended rod is one third higher than a stadia rod. (b) Wooden pole with black tape, “VAUX” written in pencil on side, function unknown.