Single Contact Morse Code Key Base_Octagonal showing the hexagonal bonding within

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

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

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

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

and storage between uses at the laboratory bench

Single Contact Morse Code Key Base_Octagonal showing the hexagonal bonding withinPlated 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.