The spring is stretched and could fly off and hit someone in the eye. The retort stand must be secured to the bench with a clamp to prevent it from falling over and hurting someone or falling on ...

A uniform metre rule, retort stand, boss and clamp, two 100 g mass hangers and 12, 100g slotted masses, a g-clamp, three lengths of string. Clamp the retort stand to the bench with the g-clamp to ...