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

supporting up to three pendulums simultaneously for harmonic-motion work

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

and storage between uses at the laboratory bench

measuring period under different loads to isolate mass from weight

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.