Mechanical Contracting & Plumbing January-December 1908 . /L^/^o^ji Tee Fig. .5—Detail of Suction Tin Pump Pit. First—For making up fine brass work,where it is desired to have all thethreads covered by the fitting, a very Fourth—For ammonia joints, a long,accurately tapered thread insures abso-lutely air, gas, or water-tight Fig. 4.—Section of Main Building, Showing Longitudinal Section Looking South. 9 PLUMBER AND STEAMFITTER February 12, 190S Fifth—And by no means the least im-portant consideration, one man caneasily cut any size thread the machinein hand will take, despite the fact t
Mechanical Contracting & Plumbing January-December 1908 . /L^/^o^ji Tee Fig. .5—Detail of Suction Tin Pump Pit. First—For making up fine brass work,where it is desired to have all thethreads covered by the fitting, a very Fourth—For ammonia joints, a long,accurately tapered thread insures abso-lutely air, gas, or water-tight Fig. 4.—Section of Main Building, Showing Longitudinal Section Looking South. 9 PLUMBER AND STEAMFITTER February 12, 190S Fifth—And by no means the least im-portant consideration, one man caneasily cut any size thread the machinein hand will take, despite the fact thatthese tools have a maximum range ofone-inch to eight-inch, inclusive. Another and important advantage isthe extreme lightness of the machines cutting dies are in separate segments,(4 in No. 1 and No. 2 stocksl. and (5in the No. 2, No. 20, and No. 3). Theylie loose in the slots, the rear end rest-ing against the tapering surfaces of theslots and pins. As the dies progress incutting the thread, the pipe itself forcesthem back against the tapering and produce a thread, clean cut and per-fect, and of standard taper. The grad-ual backing away from the centre ofeach die segments relieves the opera-tion from the friction-producing, incid-ent to all other dies, and there is thesecret of the ease in operation. TheCanadian lic
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