198
N . A . IiOLME
FIG. 17. Operatiori of the Okean grab. Note the counterweight release and the lids ( L )
(Redrawn from Lisitsin
of the two buckets, which are open during the descent.
and Udintsev, 1955.)
FIG. 18. Above, the 0.2 mr van Veen grab showing method of hoisting outboard 88 used
on the M.A.F.F. Research Veaael Sir Lancelot. The grab is worked from a rope
running through a pulley attached to a “jockey ” which slides along a wire
attwhed to the horizontal boom. To shoot the grab the jockey is outhauled by a
separate winch, which has the effect of both raising the grab and hoisting it outh e r d . The “ jockey ’’ is allowed to return inboard when the full grab is to be
lowered on to the table on deck for emptying. This method gives such clom confrol
Over tho instrument that grabbing can safely he carried out in gale-force conBelow, the van Veen grab being hauled in. It is gently lowered into the stnel
tray, which sun-ounds it on all sides SO that no material in lost, and the content8
are washed into the curved eieve Been below. The ridge to the left of centre of the
tray trips the grab while it is being set open.
Note the continuous warp rig on the van Veen grab (in contrwt to Fig. 13) in
which the closing bridle is a continuous loop running over pulleys at the ends of
the long arms. This gives a better leverage for closing than the uae of sepmnte
bridles $0 each arm. (Crown copyright reserved. Reproduced hy permieeion of
the Controller of H,M. Stationery Office.)
dit,lOnS.
N . A . IiOLME
FIG. 17. Operatiori of the Okean grab. Note the counterweight release and the lids ( L )
(Redrawn from Lisitsin
of the two buckets, which are open during the descent.
and Udintsev, 1955.)
FIG. 18. Above, the 0.2 mr van Veen grab showing method of hoisting outboard 88 used
on the M.A.F.F. Research Veaael Sir Lancelot. The grab is worked from a rope
running through a pulley attached to a “jockey ” which slides along a wire
attwhed to the horizontal boom. To shoot the grab the jockey is outhauled by a
separate winch, which has the effect of both raising the grab and hoisting it outh e r d . The “ jockey ’’ is allowed to return inboard when the full grab is to be
lowered on to the table on deck for emptying. This method gives such clom confrol
Over tho instrument that grabbing can safely he carried out in gale-force conBelow, the van Veen grab being hauled in. It is gently lowered into the stnel
tray, which sun-ounds it on all sides SO that no material in lost, and the content8
are washed into the curved eieve Been below. The ridge to the left of centre of the
tray trips the grab while it is being set open.
Note the continuous warp rig on the van Veen grab (in contrwt to Fig. 13) in
which the closing bridle is a continuous loop running over pulleys at the ends of
the long arms. This gives a better leverage for closing than the uae of sepmnte
bridles $0 each arm. (Crown copyright reserved. Reproduced hy permieeion of
the Controller of H,M. Stationery Office.)
dit,lOnS.