US$ 634.50
supporting up to three pendulums simultaneously for harmonic-motion work
Pack of 12 metal lattice support clamps fitting rods up to 12
providing a quick swap-in reference for general-purpose AC-circuit and timing-experiment work
Eight 15 x 10 x 10cm pinhole boxes
including sp3
Single Contact Morse Code Key Base_Octagonal supporting up to three pendulumsPlated spring arm with press knob and a single contact stud, configured to make and break a circuit at the rhythm of a Morse code transmission for telegraph history demonstrations.