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Record 1,  Textual support,  English

Record number: 1, Textual support number: 1 CONT

A shell-shaped or concave recess of reflecting material should be build behind the performers to act as a mirror to throw out the sound on a more or less plane wave-front ... If this reflector consists of wood sheathing against the wall, it is well to leave a space by supporting the wood on studs away from the wall. The system then acts like the sounding-board of a pianoforte, being set into forced vibration ....  1, record 1, English, - shell%2Dshaped%20recess

Record 1,  Textual support,  French

Record number: 1, Textual support number: 1 DEF

Forme semi-circulaire d'une abside (...)  2, record 1, French, - conque

Record number: 1, Textual support number: 1 CONT

Pour assurer une bonne audition on utilisera des grands réflecteurs de sons pour diriger ceux-ci vers l'auditoire. On pourra (...) utiliser des «conques» (...) Toutefois, il existe un grave inconvénient aux conques, relativement à l'orchestre ou aux exécutants; ceux-ci (...) ne s'entendent pas, les rayons sonores étant pour la plupart réfléchis vers l'auditoire.  3, record 1, French, - conque

Record 1,  Textual support,  Spanish