The experiment of using iron pavement is being tried at Boston. The blocks are twelve inches in diameter, eight inches deep. one inch thick, of cast iron, cylindrical in form, hollow, and divided ...

Figure 1 is a plan view of a section of Terry's cast-iron pavement, and fig. 2 a perspective view of a block of it. It is the invention of W. D. Terry, of Boston. The nature of the invention ...