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Grab mauls had both cylindrical and square heads. Some
had tapered eyes so that the handle would wedge tight
when used. Those with a spike in the end could be jammed
into a log in an upright position so they could be spotted
easily. Some cylindrical heads, or sleeves, were formed
by bending and did not meet at the joint. Others were
similar to sections of pipe that had either been cast
or had a welded joint. The handles were tapered to wedge
into position.
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Similar types of fasteners were used to make a log boom.
Logs were linked end to end using chain secured to grabs
or elongated log dogs. The boom was placed around the
outside of a raft, bunching the inner logs together so
they could be floated as a group. If there was no significant
current in the water, the raft had to be pulled using
a small tug, which required it to be hooked up via cables
or rope hawsers. (As an aside, in saltwater operations,
a tug was essential, current or no, and tidal currents
worked both ways, making the job difficult for a small
tug.)
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