. An encyclopaedia of architecture, historical, theoretical, & practical. New ed., rev., portions rewritten, and with additions by Wyatt Papworth. t infinite, and could not even in their leading features be compassed in awork like this. The varieties, indeed, would not be usefully given, inasmuch as the formsare necessarily dependent on the varied circumstances of each plan, calling upon thearchitect almost on every occasion to invent pro re nata. 2805. Stairs are of two sorts, straight and winding. Before proceeding with his design,the architect must always take care, whether in the straight
. An encyclopaedia of architecture, historical, theoretical, & practical. New ed., rev., portions rewritten, and with additions by Wyatt Papworth. t infinite, and could not even in their leading features be compassed in awork like this. The varieties, indeed, would not be usefully given, inasmuch as the formsare necessarily dependent on the varied circumstances of each plan, calling upon thearchitect almost on every occasion to invent pro re nata. 2805. Stairs are of two sorts, straight and winding. Before proceeding with his design,the architect must always take care, whether in the straight or winding staircase, that the per-son ascending has what is called headway, which is a clear distance measured vertically fromany step, quarter, half-pace, or landing, to the underside of the ceiling, step, or other partimmediately over it, so as to allow the tallest person to clear it with his hat on; and this isthe minimum height of headway that can be admitted. To return to the straight andivinding staircase, it is to be observed, that the first may be divided into t\ro Jlights, or be • The Vicentine foot is about 13-G inches STAIRCASES. 929
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