In reply to Paul Leader:
Yes. Yo-yo = Fall, lower off all the way to the ground, rest and then reclimb from the bottom with the ropes still clipped through the protection. It's still an oft used practice today and some so-called 'ground-up' ascents are in fact yo-yo's. Very bad form on sport routes...
As a trivial point, the term Redpoint was coined by Kurt Albert who developed the pracise of painting little red circles at the base of 'projects' in the Frankenjura. When project was finally climbed clean with no rests or aid, the circle was painted in with a 'Rotpunkt' red dot - hence the name.