This is a matter of measurement. Neither Peter Follansbee nor I suggest that the two "halves" are connected by a sheet of paper. The two resulting half-columns, as we call them, are markedly less than half a turning. As witness dopey early 20C restorations where the turnings are literally half and are thereby immediately detected. THe practice seems to have been gluing two blanks to a central piece of wood. As noted by Peter, this is quick and easy. Once the columns are turned, they are readily popped off the core with a chisel.
Note that many of these half-columns have extreme thicks and thins. Are we to believe that some guy sat there with a Japanese saw, cutting them in half?
So it's not an old wive's tale. Perhaps Al finds it easier to turn them whole and band-saw them in half, which removes enough of the core to bring the half-columns ALMOST to a period "less than half" state, but not quite.
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