rectly over a joist, if parallel with it, or at right angles to
the joists; should the position of the sill come between two joists,
that is, parallel with them, then short pieces called bridging pieces of
4 in. X 2 in. stuff are wedged between the two joists and nailed to
carry the sill.

[Illustration: FIG. 31.--Trussed Partition.]

Trussed partitions.

Trussed partitions (fig. 31) are very similar to the last, but they are
so built as to carry their own weight and also to support floors, and in
addition have braces; the head and sill are larger, and calculated
according to the clear bearing and the weight put upon them. There are
two forms of trussing, namely, queen post (fig. 32) and king post (fig.
33).

Bricknogged partitions.

Bricknogged partitions are formed in the same manner as the common stud
partition, except that the studs are placed usually 18 or 27 in. apart
in the clear instead of 12 in., and the 18 and 27 in. widths being
multiples of a brick dimension, they are filled in with brickwork 4-1/2
in. thick and always built in cement. These are used to prevent sound
from passing from one room to another, and also to prevent fire from
spreading, and are vermin-proof. Another method is to fill the space
between the studs with coke breeze concrete instead of brickwork.

Timber partitions have the advantages that they are light and cheap and
substantial, and the disadvantages that they are not fire-resisting or
sound-resisting or vermin-proof; they should never be erected in damp
positions such as the lower floors of buildings.

[Illustration: FIG. 32.--Queen Post Trussed Partition.]

[Illustration: FIG. 33.--King Post Trussed Partition.]

Solid wood partitions are used in offices and classrooms of schools, the
upper portions usually being glazed; where these partitions enclose a
staircase in a public building the London Building Act requires them to
be of 2 in. hardwood, with only small panels of fire-resisting glass.

_Timber Work._--Half timber work consists of a framework of timber; the
upper storeys of suburban and country residences are often thus treated,
and the spaces between the timbers are filled in with brickwork and
plastered inside, and rough cast outside, though sometimes tiles are
hung on the outside. In some instances in country places there is no
filling between the timbers, and both sides are lath and plastered, and
in others the timbers are solid, or facing pieces are simp