Section 17. The said commissioners shall each receive a per diem allowance of two dollars for every day necessarily spent by them respectively in performing the duties enjoined in this act, and for the purpose of enabling said commissioners to fulfil the said duties, they are hereby authorized to employ two chain-carriers and one axe-man at a per diem of one dollar and fifty cents each, which together with the pay of said commissioners shall be paid out of the funds of Fulton county, by warrants drawn by the commissioners of said county on the treasurer thereof.