| Popis: |
A mechanical violin bower, giving a constant and continuous tone as required for recording by a crystal analyzer and sound level recorder, was made and used for measuring the “response” from violins. The report on response measurements was given at the Pittsburgh meeting. This report deals only with the mechanical bower. The bow, as now made, is composed of fine silk strands, loosely spun, and treated with a quick hardening lacquer. This hair‐like thread is wound around two grooved pulleys many times, and the two ends are fastened together to form one continuous thread. Fine‐toothed guides placed in front of the pulleys keep each strand in its proper place, and form a flat belt which performs like a regular violin bow. By a proper mounting of this belt on a frame, and by having a small motor to run it, the desired results are obtained. The frame holds a violin in the same manner as held by a violinist. A spring attached to the frame and violin support hold the pressure of the bow on the string at any desired constant value. The speed of the bow is regulated by an adjustable friction gear. The silk thread bow produces tones free from scratching noises, and comparable to those produced by a horse‐hair bow. |
