500 Tons of Wire Wanted : Proposals are Invited by the Undersigned, on the Part of the Niagara Falls International Bridge Companies, for the Construction of the Wire Cables of the Railroad Suspension Bridge, of 800 Feet Span, to be Erected Over the Niagara River, Below the Falls, for the Delivery of One Million Pounds of Iron Wire, Or Any Portion of It, Not Less Than 100,000 Lbs., at the Site of the Bridge, on the Following Conditions