A boiler with horizontal sections is shown in fig.
The " roods " themselves were not The simplest form is the " flat roof " consisting of horizontal wood joists laid from wall to wall as in floor construction.
It has the horizontal racking motion mentioned FIG.
There is again a floor of folded Archean rocks overlaid by nearly horizontal strata of Lower Palaeozoic age; but these are followed by marine beds belonging to the Carboniferous period.
The molar teeth are six in number on each side, increasing in size from before backwards, and, as in the elephants, with a horizontal succession, the anterior teeth being lost before the full development of the posterior ones, which gradually move forward, taking the place of those that are destroyed by wear.