FURTHER EXPERIMENTS WITH PROTOTYPE II

   At this stage of the construction there was still time to draw some conclusions for the construction of the final instrument. The main question was how much a stronger bass bar, possibly needed to accommodate for the additional pressure of the E-string, would change the sound qualities of the instrument.

   Ueda increased the height of the new bass bar about 5%. The thickness remained the same (11mm).

    Picture 80 shows the measurements of the bass bar. Numbers above are the old measurements; numbers below are the new measures. The F-hole was drawn to show the positioning.

                Picture 80: Measurements of the bass bar. (Sketch: Ueda.)

Eastman new bassbar

   The installing of the new bass bar at first resulted in a rather big loss of volume on the lower strings. After a few days most of the original quality returned but the experience brought up some doubt whether the merits of a stronger bass bar are big enough to justify a possible loss of sound.

   Another change was a further lengthening of the E-string’s distance between bridge and tailpiece. This resulted in quite a significant improvement of the string’s sound quality.

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