My 1912 Monarch Model A 14 x 42 Engine lathe would qualify as dangerous. Really Really prior to OSHA
It has a 4 speed Turner Uni-Drive mounted above the spindle cone pulley with a 5" wide leather belt driving the spindle. No guards at all. Only mildly safer than a cone pulley on the ceiling like the arrangement that originally drove the spindle.
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My Burke #4 Milling Machine has a nice open belt for errant fingers to get caught in too...
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