US$ 60.00
dual bore sights
Hard vulcanized ebonite rod that takes on a strong negative charge when rubbed with fur
sized so the heavier D cell stays seated when student-built circuits are picked up
and redistribution during cell division for biology instruction
combining protective gripping with angular adjustment on one piece
Battery Box, Model C Capacity_50mL dual bore sightsUsed 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.