hardware braces
ginsberg scientific 7 1811 longitudinal wave demonstration
longitudinal wave demonstration great for demonstrating difficult to explain resonant waves such as propagation reflection and interference two cast metal supports 15 25in tall x 9 5in deep are extended by connector rods making a frame a white cotton cloth backing is stretched between the frames to make the demonstration visible a 3in diameter spring stretches between the frame ends that can be set up to 110cm apart spring steel rods at each with adjustable weights at each end provide the vibration that influences the wave frequency spring steel rods with adjustable weights provide the vibration that influences the wave frequency instructions are provided dimensions 18in x 6in x 11in american educational products have a lead ship time of 21 days sku amed3299