^ one row of columnsdown the centre of the main building, and three rows in thelower floor of the cistern-house. Through the head of eachcolumn a 1 inch square tie-rod extends from one gable to theother, and is Vjuilt into tlie arch, as shown at a, fig. 75. Trans-versely with the tie-rods are four… … 168 ON THE COXSTRUCTIOX OF Fig. 74.
Building, Iron and steel
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