sist the thrust which is conveyed through the gallery girders to the outer walls . The roof cost 12 £ . 15s . per square , exclusive of erection and covering . The roof over the Coventry Fig . 34 . Market Hall , designed by Messrs . Coe and Robinson ( see Figure 36 ) , is in a single span of 90… … * h e arch * conveyed through a side arch to the main wall of the building . The principals are placed about 8 leet apart , and connected by trussed iron purlins . The roof over the Middlesborough Station of the North - Eastern Railway is divided into two Fig . 37 . - 73 . 3 ' . ^ - spans of…
