HATCHWAYS

459

from the hatchway corners Battens, wedges and tarpaulins must be
efficient for their purpose and in good condition.

In Figure 48, A is the side coaming, B the end coaming, C is the
portable athwartship web beam with lightening holes in it. Cj and c2
are double stiffening angles on the web beam, c^ and c3 are the carriers
on the web beam to support the ends of the fore and afters K and H.
f represents the wooden hatch covers. as is a half round* section to
stiffen the upper edge of the coaming plate, a^ the angle bar to make a
watertight connection between the deck plating and the coaming. a2 are
double vertical angles to receive the ends of the athwartship beam,
showing holes to take screw bolts and nuts so that the beam will act
as a tie to bind the sides of the coaming together. d% is a cut beam.

Fig. 48.—Hatch Coaming.
Referring to the drawing of the end coaming plate B. we see Z>2
the carrier to receive the fore and after K. ^ is the angle connecting
coaming to deck plating D. d^ is a continuous transverse beam to
which the lower edge of the coaming is riveted, /indicates a wooden
hatch cover resting on the angle bar head ledge a4. g indicates the
tarpaulin turned over the corner of the coaming and reaching down
to the cleat %, where it is gripped between the fiat steel batten e and
the coaming when the batten is wedged up tight.
The lower figure represents a portable beam fitted in small hatches
between 10 and 16 feet in length. B is the web plate, and \ and Z>2 are
double stiffening angles, and &3 is a doubling plate. See also page 602.
Oj is the angle connecting the coaming plate A to the deck plating.
#2 indicates double vertical angles to stiffen the coaming and to
receive the' ends of the athwartship beams. a4 is a bulb angle stifEener
round the coaming, c represents the wooden hatches, and d a channel
section angle bar placed across the hatch to make the covers more