Section 30. Whoever, having the management or control of or over a steamboat or other public conveyance used for the common carriage of persons, is guilty of gross negligence in or relative to the management or control of such steamboat or other public conveyance, while being so used for the common carriage of persons, shall be punished by a fine of not more than five thousand dollars or by imprisonment in jail for not more than two and one half years.