Tilting helmet at English => English (Websters 1913) Of Explained:
Tilting \Tilt"ing\, n.
1. The act of one who tilts; a tilt.
2. The process by which blister steel is rendered ductile by
being forged with a tilt hammer.
{Tilting helmet}, a helmet of large size and unusual weight
and strength, worn at tilts.