Manufacturers and others employing workmen may, for the purpose of giving notice to them, ring bells and use whistles and gongs of such size and weight and in such manner and at such hours as the aldermen or selectmen may designate in writing.
Mass. Gen. Laws ch. 149, § 175
Bells, whistles and gongs
Official source: Massachusetts Legislature. Reproduced from public-domain Massachusetts statutes; confirm against the official source for the current text. Not legal advice.