Section 3. the Board of Survey Shall From Time to Time Cause to Be

made under its direction plans of such territory or sections of land in any town which accepts the provisions of this act, as the board may deem advisable, showing thereon the location of such street or ways, whether already laid out or not, as the board shall be of opinion that the present or future interests of the public require or will require in such territory, showing clearly the direction, width and grades of each street or way; and the board may employ such assistants and incur such expenses in regard to said plans as it may deem necessary, not exceeding the amount of money appropriated by the town for the purpose. Before making any such plan the board shall give a public hearing as to the location, direction, width and grades of streets or ways in the territory to be shown on the plan, after giving notice of such hearing by publication once a week for two successive weeks in a newspaper published in the town, the last publication to be at least two weeks before the hearing, and shall, after making any such plan, give a like notice of hearing, and a hearing thereon, and shall keep the plan open to public inspection for one month after the first publication of notice of such hearing. After such hearing and after the alterations deemed necessary by the board have been made in such plan, the plan shall be marked as made under the provisions of this act, shall be signed by the board, and shall then be filed in the office of the clerk of said town, who shall attest thereon the date of such filing.