over column heads. The end of each gutter section has an external flange enabling sections to be bolted together over a bracket to the head of the column. The brackets were designed to collect any resulting leak at the joint and channelled it down the inside of the hollow columns. Cast iron tie rods running from the columnheads, at right angles to the gutterbeams, gave lateral rigidity. The columns were the mounting points for the lineshaft bearings.

Regional variations

Though the North Light Roof Shed predominated in Lancashire

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