230											6
                                                                      
                                                                      	2.   The Roof is regulated in its form by the methoda
                                                                      adopted for crossing the interval between the walls or pens
                                                                      This may be done, first by a cross bar or lintel;  and
                                                                      the roof may be flat:  Secondly by two bars or beams
                                                                      set at a slope and supporting in the centre;  and the
                                                                      roof is  gabled;  Thirdly by an arch, and the roof vaulted
                                                                      Of these methods the first is weak and barbarous;  All
                                                                      good construction architecture c[i]onsists of modifications
                                                                      of the second or third.  For h[g]owver strong the beams or
                                                                      blocks may be, they are always stronger, and reach farther
                                                                      placed                so than so
                                                                      and the two blocks or beams a, a, are always, cheaper than
                                                                      the one block or beam b n[b]ecessary to cross the same}
                                                                      interval.
                                                                      3.   The window, or door, generally may be considered as
                                                                      "intervals" whose dignity is dependent on the methods
                                                                      of supporting their heads:  Perhaps I had better take
                                                                      this in the Second place:  after the wall:  considering
                                                                      them as I tervals and associating them with the main in-
                                                                      tervals and associating them with the main intervals between[e]
                                                                      the piers;  then after showing how the character of
                                                                      buildings is dependent on their mode of heeding such in-
                                                                      tervals;  proceed to the Gabled and Vaulted roof.

[Version 0.05: May 2008]