Section 18
SEC. 18. Collectors of customs may, with the approval of the Insular Collector, appoint such "acting deputy collectors" or "acting deputy surveyors'" as may be in their judgment necessary for the proper conduct of the public business, and they shall be authorized to sign such documents in connection with their duties as may be designated to them by the collector. Acting deputies so appointed shall receive no additional compensation for work performed by them as such.