The complete book of trades, or, The parent's guide and youth's instructor : forming a popular encyclopaedia of trades, manufactures, and commerce, as at present pursued in England, with a more particular regard to its state in and near the metropolis : including a copious table of every trade, profession, occupation, and calling, however divided and subdivided : together with the apprentice fee usually given with each, and an estimate of the sums required for commencing business (1842)
Whittock, N. (Nathaniel), 1791-1860 · London : Printed for Thomas Tegg · leaf 128
architects, called the Mansard roof, after the name of a French architect, its inventor. The most simple form of a roof is that of two rafters meeting at the top, thus — but a very slight observer will see that the rafters, having no other support than the walls, will be very likely, when the roof… … The sole o31ce of the tie-beam is to prevent the rafters from pushing out the walls ; the weight upon which is greater since the introduction of the tie-beam than it was before ; but the pressure is now perpendicular, which, unless carried to excess, is rather calcu- lated to strengthen than weaken…
Industrial arts · Occupations · Vocational guidance
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
