§ 9-1. Spark arresters.

It shall be the duty of every owner, agent, master, or captain of any vessel or craft propelled in whole or in part by steam or on which any steam engines, boilers, or stoves are used, to cover securely each funnel or smoke-stack on such vessel with an efficient metal spark arrester, the wire mesh of which shall not be less than 4 to the inch, when crossing the pierhead line in approaching any grain elevator, or any pier, in the Patapsco River or its tributaries, at which cotton or naval stores are being handled or are stored, and shall keep same covered the entire time while within said pierhead line.