We've got exactly that saw at school but driven by an electric motor; the council H&S police tried to condemn it on safety ground but then had a moment of clarity (common sense) and realised that there was nothing they could replace it with and I'd be unable to teach metalwork without it!
Have one in the workshop here too. With big billet cuts, just set it up and get on with something else till you hear the big clonk as the dog clutch disengages once the blade has cut right through. Really great even if low tech machine -not sure I'd want have to fire up a stationary engine every time I wanted take a cut though :<)