Superior Ring and Ball Apparatus Lab Equipment and Supplies_Safety Supplies 10-inch vacuum pump plate on

10-inch vacuum pump plate on an aluminum base with a stopcock and rubber seal

Lens set at 42mm diameter shipped with matching wooden supports

Rounds out a comparative thermal-conductivity set with zinc at a moderate conductivity value

letting students vary the moment arm distances on either side and find the balance point for any combination of masses

and upper airway structures in a single anatomical plane

Superior Ring and Ball Apparatus Lab Equipment and Supplies_Safety Supplies 10-inch vacuum pump plate onCast iron based Gravesande ring and ball with a 30mm ball, the heavy plinth preventing tipping while flame heating expands the ball beyond the ring diameter.