The contractor must find all materials, tools and utensils, for his part of the work, and shall not let any part of the work, except quarrying the stone, and carriage of the same and other materials, to any person, but the whole to he done by men on day-wages. The excavating the earth for the foundations, to be done by the county.
"The works are to he done under the superintendence of the surveyors of the public works for the county of Stallbrd, or such surveyor as the justices assembled in quarter sessions shall at any time hereafter appoint ; and should it at any time appear during the execution of any parts of the Nvorks to such slirvivor, that the is neglecting or doing any part of the work contrary to the true meaning and intent of this specification, the magistrates shall have it in their power to take the work out of his hands, and employ others to finish it ; and what money may be due to the said contractor, to remain in the hands of the treasurer of the county till the is completed ; and any loss that may be sustained by the neglect or misconduct of the said contractor, to be paid for out of it.
"Leon wo•k.—Specifieation of the iron work for a bridge intended to be erected over the river Trent, at a place com monly called High Bridge, near to 1 landsaere, in the county of Staff "Upon each :ilmtment is to he a springing plate of cast iron, each cast in one piece. and- to have shoulderings and sockets to the ends of the ribs. Each 'date is to be of the form and dimensions as shown upon the drawings. The back of each socket, or the part against which the ends of the ribs ill abut, is to be clipped. and made to have a true and even thee to the exact radius of the arch.
"There is to be but one arch of 1-10 feet span, and rising 14 feet ; the arch is to be composed of 5 ribs, each cast in 7 pieces of equal lengths. The ribs arc to be inches deep, in the direction of the radius, and of the exact shape and (111110151011s as shown upon the draft jugs. '1'he parts of each rib and the ribs are to he connected by cast-iron tie or connecting plates. each cast in one piece, and passing quite n•ross the arch; the parts composing each rib are to have cast upon each of the ends tt 'licit abut against the connecting or tie plates, and arc to be secured to them by :; Ina square threaded wrought screw-pins in each flange. Each flange is to be clipped, and made true over the N% hole of its surthce to the exact radius of the arch, so as to nave a solid and true joint. The ends of the parts of the ribs which are to be fixed in the sockets of the springing plates are to be clipped, and made true over their whole sut- thee. of section, so that they may have a sound, solid, and
true abutting joint. The parts of each tie or connecting plate against which each part of the rib abuts, Illnst, titr the whole area of each flange, be made to the exact radius of the arch, and be clipped and made to have a true and even thee. Joggles are also to be cast upon each tie or conneeting plate. which are to fit into the joggles cast on theI f 1 er.s o: parts of the ribs. Both the male joggles upon the tie or connecting plates, and the female juggles at the ends of the ribs, are to be made to the radius of the arch, and clipped, and made true over their whole surface, so that each joint 11111V be solid. and true throughout.
" Upon the top of each of the ribs is to be a shouldering, running its whole length, having sockets to receive the joggles upon the bottom of' the spandrils. Diagonal braces of cast-iron, of the sane section, form, and dimension, and disposed in the manner as represented in the drawings, are to be used; each of the parts composing the braces are to abut against the ribs in the situations and in the manner shown upon the drawings, and secured to them by keys and cotters, or wedges, filed, and made true upon their edges; the parts of the braces which abut against the ribs, and also the thee of the snugs or bed-pieces, cast upon the ribs to receive them, must be chipped so that they may have a true solid joint.
The spandrils are to be of the same form and dimensions as shown upon the drawing. The spandrils over each rib are to be the same in every respect, excepting that upon the outside thee of the outside spandrils a fillet must he cast, running round each opening, as shown upon the drawing; the fillet to he 1,1 inch wide, and projecting -1 of an inch upon the bottom of the spandrils; at the point of each lozenge must be east joggles to fit into sockets on the tops of the ribs. Ears also to be cast at the same place; the situations of the and ears marked upon the drawings. At the central intersection of each lozenge there must be a brace running quite across the bridge ; each must be done as shown upon the drawings, viz., having a wrought-iron screw bolt I A- inch in diameter, passing through cast-iron tubes, with washer, plates, &c., quite across the bridge. These braces are to be placed in the situations as marked upon the drawings. The spandrils may be cast in any convenient lengths, and con nected by flanges of proper strength, and 1 inch wrought iron screw-pins.