Wooden Adjustable Organ Pipe, 34.5" Physics_Electricity & Magnetism Hand-cranked friction-wheel drive sandwiched between

Hand-cranked friction-wheel drive sandwiched between clear acrylic plates

Carp fish model with removable air bladder

Used to demonstrate broad pole-separation effects

Wider 70 x 20 x 8mm cross-section on this Alnico bar pair gives a broader pole face than typical bar magnets

the f/3 curvature stretching the focal throw for demos that need the focal point set comfortably beyond the mirror face

Wooden Adjustable Organ Pipe, 34.5" Physics_Electricity & Magnetism Hand-cranked friction-wheel drive sandwiched betweenPolished wooden organ pipe 34. 5 inches long with no fixed pitch, sliding through a full octave from C5 (521Hz) to C6 (1024Hz) for hands on comparison of length to fundamental frequency.