[Illustration: FIG. 16]
=30.= A common method of fastening a rope to a drum, Fig. 16 (_a_),
is to pass the rope through a hole in the drum rim and then around
the shaft, clamping the end to the rope between the shaft and shell,
as shown. Care should be taken to make the radius of curvature of the
hole at _a_ as large as possible so that the rope will not be bent any
sharper than is necessary. When an iron drum is used, the thickness of
the rim does not afford enough depth in which to bend the rope and it
is necessary to build in a pocket for the purpose, as shown at Fig. 16
(_b_). It is well to make both sides of this pocket with a long radius
to avoid damaging the rope in case all the rope is accidentally unwound
and the drum backed so as to bring the rope against the other side of
the pocket.