ON A NEW MODE OF COVERING ROOFS WITH PLANKING.
W CUBITT · Minutes of the Proceedings of the Institution of Civil Engineers · 1840
a new T h e roof itself is framed in the usual manner with principals and coyel.inrrpurlins, but without rafters.T h e boards intended for the covering mode of roofs & are cut, by means of a circular saw, from planks 7 inches wide by 'martis.24 inches thick, in such manner that each plank makes two