Standard Rheostat, 8.5Ω, 5A Max Lab Supplies_Spring Scales Sheet-metal D battery holder for

Sheet-metal D battery holder for two D-cells with spring-loaded terminals and 4 mm banana plug outputs

easy to clean and maintain

and spectral-line work

closing when a magnet is brought near to introduce magnetic-actuated switching alongside hand-operated switches

where colored liquid in a U-shaped section shifts measurably as air blown through a constricted glass tube creates pressure differences

Standard Rheostat, 8.5Ω, 5A Max Lab Supplies_Spring Scales Sheet-metal D battery holder forStandard rheostat at 8. 5 ohms and 5A with oxidized constantan winding on a vitreous enameled steel tube, the lower resistance higher current option in the standard rheostat line.