Single Contact Morse Code Key Base_Octagonal supporting up to three pendulums

supporting up to three pendulums simultaneously for harmonic-motion work

this polypropylene graduated cylinder set is Class B-tolerant

these concavity microscope slides hold liquid samples for hanging-drop preparations and observation of specimens in suspension

showing the hexagonal bonding within each layer and the weak bonding between layers

providing a quick swap-in reference for general-purpose AC-circuit and timing-experiment work

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.