I am the last generation of Splicers that hand spun wires.
The Splicer in the Manhole picture is beginning a random splice.
The only sequential order in randoming is bunch (usually 100 pairs)
identification. The core bunch is number one and rotation follows
the rule "clock to the block" and counter clockwise to the C.O.
The white sleeves on the left side are placed first on all the
pairs. When the pair is spun, trimmed off, and folded back into 
the now straight wire the sleeve is slid forward to cover the
exposed copper that is shorter in length than the waxed sleeve.
After all the random splices are completed we would then test and
identify each pair for termination purposes at each end of the
"run." The Splicers Trailer is commonly know as a Tool Cart. The
center fold-down door in the middle became a work bench which we
prepared lead sleeves to be "lead wiped" and create an airtight
splice enclosure. Underground cables are pressurized to trigger
an alarm if a leak develops.

- Tom Steed, Mid Hudson (NY) Cable Maintenance