Fig. 125. Arrangement of Risers around Well-Hole,
with Risers Spaced Full Width of Tread.
Fig. 126. Plan of Stair
Shown in [Fig. 123].
Fig. 127. Plan of Stair
Shown in [Fig. 124].
Fig. 125. Arrangement of Risers around Well-Hole,
with Risers Spaced Full Width of Tread.
Fig. 126. Plan of Stair
Shown in [Fig. 123].
Fig. 127. Plan of Stair
Shown in [Fig. 124].