SIR—I have introduced the suspension principle in two or three instances
with great success, where nothing else could have answered the purpose;
and as it was through you that the first impression was made upon my mind
of its practicability for building purposes, I at once send you a rude
sketch of the last one I have used. It is to carry a roof, lead-flat, and
ceiling; it is in connection with the old mansion, an enlargement of the
cooking kitchen, taking out the whole of the end wall, 16 feet wide, and
making or adding to the same a large bow, which is covered with lead. I
have marked the different parts as follows:
A. Suspension-rods secured to walls, 1 inch round, iron, flat in the
walls.
B. Screw bolts, 1 inch round, iron.