T. Henry, A Digest of the Ordinances of the Corporation of the District of Penn, and Acts of Assembly Relating Thereto Page 286, Image 286 (1852) available at The Making of Modern Law: Primary Sources.

Ordinances [of the District of Penn, PA], Ordinance of July 14, 1851, An Ordinance Providing for the Appointment of a Captain of the Watch, and the establishment of a Nightly Watch in the District of Penn. § 1. Be it ordained, etc. That from and after the passage of this ordinance, there may or shall be erected a sufficient number of watch houses, in such parts and places in the district as the commissioners may determine. § 2. That there shall be appointed a captain of the watch, and a sufficient number of able bodied men as watchmen, as may be deemed necessary from time to time; and it shall be the duty of the said captain to aid the watchmen in preventing burglaries, robberies, and other outrages and disorders within the district. And to that end, be and they are hereby empowered and required to arrest, apprehend and confine all persons whom they shall find disturbing the peace, or shall have cause to suspect of any unlawful or evil design, or persons discharging or firing off any hand gun, pistol or other firearms, or shall cast, throw or fire any squibs, rockets or other fireworks, or make or assist at making bonfires within the regulated parts of the district in the night time; and shall take the person or persons so apprehended, as soon as conveniently may be, before the police or other magistrates, as may be from time to time directed, to be examined and dealt with according to law…