It shall be lawful for any person or persons employed under and by virtue of an act of the Congress of the United States, passed February the tenth, eighteen hundred and seven, and all acts supplemental thereto, at any time hereafter to enter upon lands within this state for the purpose of exploring, surveying, triangulating or leveling, or doing any other matter or thing which may be necessary to effect the objects of said act; and to erect any works, stations, buildings or appendages requisite for that purpose, doing no unnecessary injury to private or other property.