Posted 3 years ago
Visible fences were required by law in most of the states during the late 19th century. The top one is a patented warning device by Robert Boone, of Philadelphia, Pennsylvania July 1885, patent no. 321,787. The other two appear to be fanciful recreations of the Hiram B. Scutt warning block patent of February 10, 1880, patent no. 224,482.