They are built of wood, balloon frame, with a plain pitch roof, without ornament.
(p. 067) The balloon frame was divided into seventeen compartments, each of which held a ballonet filled with hydrogen gas.
If a mechanic is employed, the balloon frame can be put up for forty per cent.
The early history of the balloon frame, is somewhat obscure, there being no well authenticated statements of its origin.
The balloon frame has for more than twenty years been before the building public.
The balloon frame (fig. 36) is composed of much smaller scantlings and is more rapidly erected and less expensive.