It m a y not always be poskible or convenient to uue such heavy
gem, aird tlic important atlvairccv in design of samplers have been
those which increased the efficieiicy of sampling without unduly
adding to the weight of tbe cqriipment. Since muds can be penetrated
wi thoirt difficulty, and ~ t o n c s present a nearly insoluble sampling
problem, it will be seeti that possihle improvements lie mainly towards
better snmplirrg af firm ~ ~ ~ 1 1 ~ ~ ~ ~ ~ ) ~ c ~ e
sands where the €orces provided by the neccsstuily limited weight of the sampler are innu
to give full pwtration.
There are various means by which penetration may be assisted, the
first being the kinetie nergy provitled by the momentum of an instrument lowered at spee to tho hot tom. W ~ i ~ o ~ t ~ ~ ~ t ~ ~ ~
the relstively
large are& to be sampled ~
e
~
~
~
s
a rather broad ~~~a~~~~~ which
presents cuiisiderahle ~ ~ ~ j s ~ a ~ c ~
to sinking hcf. s p ~ d
t8hrough the water
(see criticism of C'fardeiev (T94.5) grab I n Lisitslri and fidinbev, 1955).
gem, aird tlic important atlvairccv in design of samplers have been
those which increased the efficieiicy of sampling without unduly
adding to the weight of tbe cqriipment. Since muds can be penetrated
wi thoirt difficulty, and ~ t o n c s present a nearly insoluble sampling
problem, it will be seeti that possihle improvements lie mainly towards
better snmplirrg af firm ~ ~ ~ 1 1 ~ ~ ~ ~ ~ ) ~ c ~ e
sands where the €orces provided by the neccsstuily limited weight of the sampler are innu
to give full pwtration.
There are various means by which penetration may be assisted, the
first being the kinetie nergy provitled by the momentum of an instrument lowered at spee to tho hot tom. W ~ i ~ o ~ t ~ ~ ~ t ~ ~ ~
the relstively
large are& to be sampled ~
e
~
~
~
s
a rather broad ~~~a~~~~~ which
presents cuiisiderahle ~ ~ ~ j s ~ a ~ c ~
to sinking hcf. s p ~ d
t8hrough the water
(see criticism of C'fardeiev (T94.5) grab I n Lisitslri and fidinbev, 1955).