Battery Box, Model C Capacity_50mL Research-grade oxygen spectrum tube at

Research-grade oxygen spectrum tube at 26cm with a 10cm central capillary

Hard vulcanized ebonite rod that takes on a strong negative charge when rubbed with fur

Shows oxygenated and deoxygenated blood paths between heart chambers and alveolar surfaces through seven hand-painted removable parts designed with medical-professional input

and major vessels of the human heart

Insulated 10

Battery Box, Model C Capacity_50mL Research-grade oxygen spectrum tube atUsed to enclose dry cells safely for student built circuits, this battery box adds insulated terminals and prevents short circuits from rolling cells touching exposed lab metalwork.