The carpenter's new guide: being a complete book of lines for carpentry and joinery. Treating fully on practical geometry, soffits, brick and plaster groins ... with a great variety of designs for roofs, trussed girders ... with many other things entirely new: the whole founded on true geometrical principles; the theory and practice well explained and fully exemplified on eighty-four copper-plates; including some observations and calculations on the strength of timber (1830)
Nicholson, Peter, 1765-1844 · Philadelphia, J. Grigg · leaf 161
eds break indriving, and consequently do more hurt than good. Roofs will be much stronger if the purlines are notched above the principal rafters, thanif they are framed into the side of the principals j for by this means, when any weight is ap-plied in the middle of the purline it cannot bend,… … Wf K ■^ V
Carpentry
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
