456

HISTORY OF ENGINEERING.

Rook I.

engineer acting under his directions, and of such quality as shall be approved of by theprincipal or resident engineer.

“ To find, provide, and erect from time to time to the satisfaction, and according to thedirections of the principal engineer, such steam engine, or steam engines, with proper pumpsand machinery of every description, as shall be necessary to keep the works clear of water.

“ To find and provide to the satisfaction, and according to the direction, of the principalengineer, or the resident engineer acting under his direction, all such places for depositingand working materials, and all such temporary roads, railways, gangways, stages, scaffold-ings, pile engines, cranes, crabs, blocks, shears, tackles, chains, barrows, ropes, planks, andall such other engines, machines, tools, implements, utensils, and labour, as shall be necessaryfor the execution of the said works, as well at the said intended bridge as at the place orplaces to be provided for by the contractor for depositing and working materials ; and alsoall such boats, barges, carriages, and labour as shall be requisite for conveying the saidmaterials, engines, machinery, and implements to and from the places where the samerespectively are to be used for clearing away superfluous earth and rubbish.

“ To drive and provide such guard piles, dolphins, moorings, and other fences and pro-tectors as shall be necessary for the safety of the works, to bear all risk and responsibilitywhatever attending the execution of the works, and without any delay to make good alldamages of every description which may happen to the works, or any parts thereof,during the progress of the same ; and pay the expenses of, or make good all settlementsor delects which may happen to any wharfs or buildings near the works, and allother damages which may be occasioned by, or in consequence of, the works or anyof them.

“ To make and contract according to the satisfaction and according to the directions ofthe principal engineer, or the resident engineer acting under his directions, such works asshall be necessary for preventing the possibility of injury or damage to the present bridgeor the starlings thereof, by the execution of the works, or in consequence of removing thenosings of the western extremity of the sterlings of the present bridge, which the contractor,with the approbation of the principal engineer, is authorized to take away for the moreconvenient erection of the cotferdams, or in consequence of any alteration in the presentbridge, which shall be made with the approbation of the committee and of the principalengineer.

“ In case any injury or damage shall happen to the present bridge, or the sterlingsthereof, during the progress of the works, the contractor is without any delay to make goodand repair the same.

“ To construct, remove, and fix the cofferdams, guard piles, and moorings, and othertemporary works in such places, at such times, and in such manner as the principalengineer, or the resident engineer acting under his directions, shall direct.

** The execution of the works to be arranged in such manner that a free and sufficientpassage shall at all times be preserved for such vessels as can now pass through the presentLondon Rridge.

“ To provide during the progress of the works such watchmen, gate-keepers, and otherpersons as may be necessary for the protection thereof.

“ The contractor shall constantly attend to the works during the progress thereof, and tothe due execution thereof in manner aforesaid.

“ All the works shall he performed, finished, and completed to the full and entire satis-faction of the principal engineer in the manner aforesaid, and according to the true intentand meaning of the contract, in or before the day of

“ To clear away before the said day of , all the dams, scaffolding

materials, and rubbish, and remove all other obstructions occasioned by the building of thebridge, except such part thereof (if any) as shall be directed to be left for any further timeby the principal engineer.

“ In case the principal engineer shall, at anytime or times during the progress of the saidworks, think proper to cause any alterations in, or variations from, the original plans andthe above specification to be made on account of the nature of the foundations, or any othercircumstances, either by increasing the works, or the scale of magnitude thereof, or alteringthe quality of any part thereof, or omitting some part, or diminishing the works, or the scaleof magnitude thereof, or altering the quality of any part of the works, or the materials tobe used therein, or otherwise ; and shall give notice in writing to the contractor of suchalterations or variations, the contractor is to execute, perform, and complete the worksaccording to such alterations or variations in the manner, and within the time, in which theworks ought to be completed according to the true intent and meaning of the contract; andsuch alterations and variations shall not vacate or lessen the validity of any of the covenantsor agreements contained in the contract, hut such sum of money shall be added to ordeducted from the sum agreed to he paid to the contractor, as the principal engineer shallestimate to be the value of such alterations or variations, according to the measurementsthereof, at the prices mentioned in the scale of prices to be delivered by the contractor at