Morse Code Key on Wooden Base with 4mm Terminals Subcategory_Electricity and Circuits the drilled aluminum ball gives

the drilled aluminum ball gives a lightweight contrast to steel and brass balls of the same size in pendulum period and momentum-transfer demonstrations

sized to protect a pair of 50mm (2-inch) bar magnets between lessons and isolate them from steel benchtops

Precision-cut interchangeable plugs in split brass contact blocks select between constantan-wire decades

Designed for comprehensive lens

Morse Code Key on Wooden Base with 4mm Terminals Subcategory_Electricity and Circuits the drilled aluminum ball givesWooden base Morse code key with a black knob, two adjustment screws on a spring loaded aluminum bar, and 4mm wire terminals, dropping into the Worcester Circuit Board Kit for telegraph work.