Master may furnish or substitute a clear or substantially transparent but functionally similar musical instrument to any House Boy who plays, practices, or is taking lessons; and any House Boy who is provided with or instructed under this rule to use a transparent instrument or non-musical accouterments shall do so to the best of his ability, regardless of who may be present and could observe.

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[2019 version not available online]

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Rule 151B-M — Transparencies (Instruments and Accouterments) 
Classified: Master’s Philosophy