A simple method for making a sonic tube length measuring instrument

Create a simple sound tube length measurement environment, referring to the dedicated sound tube length measurement environment.

Measure the required column length through the sound holes inside the piano body. The relevant data has been proven to be effective in practice, just as useful as specialized measuring instruments.

The manufacturing method is mainly composed of three components. Take the 5mm TV antenna and 6mm casing, cut the required length, and put them together. Take a 4mm thread and weld it into a 6mm woven tube. For each measurement, draw a line at the position where the outer tube moves, remove the measuring device, change the extension of the tube to emphasize the position, and measure the distance between two points, the fixed end and the moving end. Measure the length of the sound column

On top of the object. Take a 4mm long corner and fold it into the shape of a handle. Combine these three together, you can use them. To see clearly, paste the white strip on