On Mar 16, 7:34*am, Ecnerwal
wrote:
Reciprocating "gang" saws were run by various forms of power - the
"gang" aspect was that you set the thickness of planks by spacing the
blades, and sawed several planks at once using 4, 5 or more blades. They
leave a distinctive pattern on the cut plank.

--
Cats, coffee, chocolate...vices to live by

There was a History Channel (maybe Discovery Ch) show about Classical
Rome or one of the other classical civilizations. They showed a stone
that had been partially sawn by a gang saw of around 8 blades.
Karl