A ready reckoner is pretty much a rafter length calculator a book full of tables for working out the rafter lengths quickly and easily. In practical terms these constructions will cover most traditional roof forms and take account of the hip and valley infills used on trussed rafter construction unless fully. How to use the ready reckoner for the purposes of explaining the use of the ready reckoner reference should be made to the roof constructions illustrated in figs 4 and 5.
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