Pulley Block Assembly Set Gifts_Bar sized to demonstrate cathodic deposition

sized to demonstrate cathodic deposition and the coulometric form of Faraday's first law

visualizing sound-transmission dependence on a medium

8 mm outside diameter and open at both ends

Sliding-window gold-leaf electroscope with anodized aluminum walls and an internal scale

Six-piece 3-inch optical lens set combining three double-convex and three double-concave glass lenses at 200mm

Pulley Block Assembly Set Gifts_Bar sized to demonstrate cathodic depositionFifteen frame pulley block assembly set with five each of single, double, and triple sheave frames, plus locking bearing pins and hooks for building varied compound pulley configurations.