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Article CEREMONY OF OPENING WEARMOUTH BRIDGE; ← Page 3 of 11 →
Note: This text has been automatically extracted via Optical Character Recognition (OCR) software.
Ceremony Of Opening Wearmouth Bridge;
and the other two are in proportion : on each side of the Arms are Grooves , ( i inch deep , and 3 inches broad , ) for the ptrpose of receiving malleable or bar-iron ; and in each Arm are two bolt-holes . D , ( FIG . 2 . ) -represents two of these Blocks placed together , and the joints confined to their respective positions by the
bar-iron on each side of the Arms , as at E , E , E ; which , v .-ith other similar Blocks so united , ' and bearing upon each other , become a Rib . FIG . 3 , and F , F , ( FIG . 2 , ) are hollow Tubes , 6 feet long , ' and 4 inches in diameter , having shoulders at each end ,. with holes answering to those in the Arms of the Blocks . —G . is a
Block of another Rib , connected with the former by the Tubes F , F , placed horizontally . Through the holes in the Shoulders and Arms of the Block , and Bar-iron , are Bolts ( fastened with cotterels , or forelocks , ) as at H , H , H , H . . - The Blocks being united with each other in Ribs , and the Ribs connected and supported laterally bthe Tubesas above described ,
y , the whole becomes one mass , having the property of keystones cramped together . The Arch is a segment of a circle , ( of upwards of 440 feet in diameter ) whose chord , or span , is 236 'feet 8 inches ; its versed sine , or heighr , about 34 feet ; and its breadth 32 feet , consisting of six ribs . The spandrels are filled up by cast-iron circles placed upon the ribs ,
the two largest of Avhich are each 13 . feet in diameter , the rest gradually diminishing in size towards the centre . The whole is braced and tied together at the top by bars of malleable iron , laid in the form of St . Andrew ' s crostet , and by timbers , on which planks are laid , Avhich support the gravel , stones , & c . of the road . From the river to the . under side of the Arch is 9 6 1-half feet , which admits ships " of considerable burthen to pass under it without lowering their masts The Piers , & c . are built with freestone , founded on limestone rocks .
Tons . C . O . lb . The AVeight of the Cast-iron Blocks is 139 n ' o 6 Cust-metal Tubes or Stays , about - 27 o o o Malleable Bar-iron and Bolts , about 36 o o o Total Weight of the-Arch 202 11 06 Iron Spandrels , Timber , Freestone ¦
Flags for Foot-paths , Gravel , Lime-, stone , & c . for Carriage Road , Iron Palisades , Lamp-posts , & c . about , 720 o 00 Total "Weight about - 922 n 06 A stone arch of the same span would have been above fourteen times the weight . The cast and malleable iron is japanned over with coal tar and pounded charcoal , Avhich was laid on when the iron Avas hot . The
Note: This text has been automatically extracted via Optical Character Recognition (OCR) software.
Ceremony Of Opening Wearmouth Bridge;
and the other two are in proportion : on each side of the Arms are Grooves , ( i inch deep , and 3 inches broad , ) for the ptrpose of receiving malleable or bar-iron ; and in each Arm are two bolt-holes . D , ( FIG . 2 . ) -represents two of these Blocks placed together , and the joints confined to their respective positions by the
bar-iron on each side of the Arms , as at E , E , E ; which , v .-ith other similar Blocks so united , ' and bearing upon each other , become a Rib . FIG . 3 , and F , F , ( FIG . 2 , ) are hollow Tubes , 6 feet long , ' and 4 inches in diameter , having shoulders at each end ,. with holes answering to those in the Arms of the Blocks . —G . is a
Block of another Rib , connected with the former by the Tubes F , F , placed horizontally . Through the holes in the Shoulders and Arms of the Block , and Bar-iron , are Bolts ( fastened with cotterels , or forelocks , ) as at H , H , H , H . . - The Blocks being united with each other in Ribs , and the Ribs connected and supported laterally bthe Tubesas above described ,
y , the whole becomes one mass , having the property of keystones cramped together . The Arch is a segment of a circle , ( of upwards of 440 feet in diameter ) whose chord , or span , is 236 'feet 8 inches ; its versed sine , or heighr , about 34 feet ; and its breadth 32 feet , consisting of six ribs . The spandrels are filled up by cast-iron circles placed upon the ribs ,
the two largest of Avhich are each 13 . feet in diameter , the rest gradually diminishing in size towards the centre . The whole is braced and tied together at the top by bars of malleable iron , laid in the form of St . Andrew ' s crostet , and by timbers , on which planks are laid , Avhich support the gravel , stones , & c . of the road . From the river to the . under side of the Arch is 9 6 1-half feet , which admits ships " of considerable burthen to pass under it without lowering their masts The Piers , & c . are built with freestone , founded on limestone rocks .
Tons . C . O . lb . The AVeight of the Cast-iron Blocks is 139 n ' o 6 Cust-metal Tubes or Stays , about - 27 o o o Malleable Bar-iron and Bolts , about 36 o o o Total Weight of the-Arch 202 11 06 Iron Spandrels , Timber , Freestone ¦
Flags for Foot-paths , Gravel , Lime-, stone , & c . for Carriage Road , Iron Palisades , Lamp-posts , & c . about , 720 o 00 Total "Weight about - 922 n 06 A stone arch of the same span would have been above fourteen times the weight . The cast and malleable iron is japanned over with coal tar and pounded charcoal , Avhich was laid on when the iron Avas hot . The