Single Contact Morse Code Key Base_Octagonal this polypropylene graduated cylinder set

this polypropylene graduated cylinder set is Class B-tolerant

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

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

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

Single Contact Morse Code Key Base_Octagonal this polypropylene graduated cylinder setPlated 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.