Spare Bulb for Ray Box, 12V 21W Subject_Biology Decade capacitance box stepping from

Decade capacitance box stepping from 10pF to 100pF in 10pF increments at plus-or-minus 5% on a 63V rating

95A single-phase rheostat on a 300x56mm tube with cover-protected constantan winding and 4mm safety socket terminals

Straight receiver adapter with cone in borosilicate glass features 29/32 socket and 29/32 cone for distillation collection and apparatus connections

letting students compare force ratios across four different radii in a single assembly

Spare Bulb for Ray Box, 12V 21W Subject_Biology Decade capacitance box stepping fromBright filament bulb rated 12V 21W, dimensioned to fit the PH0600A ray box housing as a drop in replacement for the original lamp.