I saw something similar to that that was a pipe vise. There were two internally toothed Vee block type things that went into guides visible on right and left side in that picture, once bolted back together one used the jack-screws to tighten the vee blocks onto the pipe to hold it tight to work on, cut threads, etc.
I saw it in an old blacksmith shop.
Steven
I saw it in an old blacksmith shop.
Steven
