Single Contact Morse Code Key Base_Octagonal Eight aluminum-shank tuning forks tuned

Eight aluminum-shank tuning forks tuned to scientific pitch (C4 = 256Hz) and ranging from 5 9/16 to 7 1/8 inches

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

Pack of 12 metal lattice support clamps fitting rods up to 12

supporting up to three pendulums simultaneously for harmonic-motion work

Single Contact Morse Code Key Base_Octagonal Eight aluminum-shank tuning forks tunedPlated 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.