DETAIL OF DOUBLE BOTTOM

593

Fig. 3, showing the tank side arrangement of a C.D.B.

/4—A vertical angle connecting the floor plate to the margin

plate 0.
h—A vertical angle connecting the tank side bracket H to the

mai'gin plate G.
c—A continuous fore and aft angle connecting the lower edge

of the margin plate to the shell plating.
K—A hole in the floor to reduce the weight of material and to

provide access to the cellular spaces.

The upper figure shows in plan how the connection of the tank
side bracket to the margin plate may be strengthened by means
of a half-diamond plate.

C—The flange of the margin plate.

G—The half-diamond riveted to the flange and to the reverse

frame H on the upper edge of the bracket.
F—The stiffening angle along the top edge of the floor.
D—The inner bottom plating.
Figures 2 and 3 are enlargements from the drawing on page 440.

Fig 4 —Stringer..
Stringer.—Figure 4 shows a plan and a sectional elevation of
part of a stringer.
$—A continuous stringer angle.
/—Intercostal plate slotted in way of frames F and F.
Q—Chock angles fitted between the frames to connect the stringer
plate to the shell plating P.
L—A short lug piece to connect the continuous stringer angle S
to the inner edge of the bulb frame.