A.
The fire limits shall be bounded and described as follows: Beginning at Merrimack River at the northeast end of a continuation of the middle line of Salem Street; thence southeast along the middle line of Salem Street to the middle line of Market Street; thence southeast along the middle line of Market Street to the middle line of Suffolk Street; thence south and southwest along the middle line of Suffolk Street; thence to the middle line of Fletcher Street; thence southeast along the middle line of Fletcher Street to the middle line of Dutton Street; thence southwest and northwest along the middle line of Dutton Street; thence to the middle line of Willie Street; thence southeast along the middle line of Willie Street to the middle line of Carleton Street; thence southeast along the middle line of Carleton Street to the middle line of Marshall Street; thence southwest along the middle line of Marshall Street to the middle line of Gates Street; thence southeast along the middle line of Gates Street to the middle line of Westford Street; thence northeasterly and easterly to the middle line of Westford Street to the middle line of Chelmsford Street; thence northeasterly along the middle line of Chelmsford Street to the middle line of Thorndike Street; thence southeast along the middle line of Thorndike Street to the middle line of Summer Street; thence northeast and southeast along the middle line of Summer Street to the middle line of Gorham Street; thence northeast and east along the middle line of Charles Street to the Concord River; thence northeast along the Concord River to the middle line of Stone Bridge and Andover Street to the middle line of Fayette Street; thence north and northeast along the middle line of Fayette Street to the Merrimack River; thence northwest along the Merrimack River to the point at the beginning.
B.
The fire limit line is to extend 100 feet in every direction beyond the above-mentioned district. No wooden building shall be constructed within such limits, except as hereinafter provided, established by this section.