NORTHERN LINE.

Sixth Figure.

A technical illustration depicts a complex boring machine. Two drill bits with different heads appear at the top. Below them, a long drill bit featuring a crank handle and a circular blade is shown in profile. A cylindrical pipe section is presented beneath this. At the base, a large assembly shows the pipe fitted with an ornate, scroll-work bracket, a circular saw blade at the right end, and a hand-crank at the left end.

WESTERN LINE. # EASTERN LINE.

SOUTHERN LINE.