6.—The Board may in the construction of the works authorised by this Act deviate laterally from the line thereof to the extent delineated upon the deposited Plans and may deviate from the levels of all or any of the works shewn on the deposited Sections in the case of Butt Bridge to any extent not exceeding five feet upwards and to any extent downwards and in the case of the Transporter Bridge to any extent not exceeding twenty feet upwards or five feet downwards.
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