tuning pipe

The tuner should carry with him a tuning pipe or fork tuned to 3C in one or the other of these pitches.

Before applying this rule, it is well to try 3C with tuning pipe or fork to see if the piano is below international pitch.

This latter cause can be ascertained in cases only where you have started from a tuning pipe or fork.

It was not unlike to the sound made by a boy with a tuning pipe.