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64 Rotary Pump Efficient (Continued from Page 60) the surface of this drum is cut a wide, but shallow, helical groove, across which lies a dam, or vane. This vane is short, light and rectangular in shape, and may be made of metal or lignum vitae. This vane _ reciprocates under the positively camming action of the MARINE REVIEW both statically and dynamically. The pump shaft is packed with an improved form of stuffing box at the inboard end, and an oilless blind bear- ing is used on the outboard end for small, fractional horsepower pumps. On larger pumps, both ends of the shaft are packed. The shaft bearing is of the ring oiler type and is out- board of the packing and packing gland. The gland can be removed FIG. 5—LINER KEYED TO HOUSING IN QUADRUPLE ARRANGEMENT OF CAMS ON NEW ROTARY PUMP—OPENINGS SHOWN ARE INLET AND OUTLET PORTS helical groove in the drum. The drum rotates, but the vane is restrained from rotating by the fact that it is assembled through a slot in a dia- P. V. G. MITCHELL, RECENTLY APPOINT- ED VICE PRESIDENT OF THE INTERNA- TIONAL MERCANTILE MARINE CO.—HE WAS FORMERLY RESIDENT DIRECTOR OF THE RED STAR LINE OF THE I. co. IN ANTWERP M. M. phragm which is either a part of, or rigidly connected to, the pump hous- ing. Mounted concentrically in the drum housing and on the drum shaft, the drum is thus naturally balanced and new packing inserted without dis- turbing the oilbearing. Ports of the pump are symmetrical- ly spaced with respect to the vane, and the pump may consequently be op- erated equally well in either direc- tion of rotation with no _ physical change. The vane engages in the cam groove at the upper element of the main drum, and in the larger sizes is accessible through a hand hole plate. In the chart marked Fig. 3, is given the volumetric and mechanical effici- encies for this pump at 1150 revolu- tions per minute over a range of discharge pressures from zero to 60 pounds per square inch, pumping water. The tests were conducted on a brand new pump over a period of 500 hours continuous run for each liquid. A general view of the new 2% inches, 88 gallons per minute rotary pump, direct connected to a commercial high speed motor is shown in Fig. 1, while Fig. 4 shows in detail the quadruple arrangement of the cams on the shaft, and Fig. 5 the liner keyed to the housing. The open- ings in the liner are inlet and outlet ports and the reciprocating vanes are shown in place. For many years engineers have been wont to give little respect to rotary pumps except in limited ap- plications; but the American Machine & Foundry rotary pump bids fair to compete efficiently in many lines hitherto closed to this general type. January, 1926 Moore Yard Low Bidder for Key Ferries The Moore Dry Dock Co. with a bid of $1,659,703 proved to be ‘the low bidder on the two new double ended, all steel, turbo-electric ferry boats for the Key System Transit Co. Five shipyards in and about San Francisco submitted tenders to McCauley, Hibbs and Smith, naval architects and ma- rine engineers of San Francisco, de- signers of the vessels. The vessels will be 276 feet in length over all and 47 feet molded beam, and beam over the guards, 70 feet, and molded depth, 21 feet. A list of all bids received follows: General Engineering & Drydock Co., $1,927,594, eleven and twelve months; Bethlehem Shipbuilding Corp., $1,732,369, ten and eleven months; Pacific Coast Engineer- ing Co., $1,879,996, twelve and thir- teen months; Hanlon Drydock & Ship- building Co., $1,792,576. Baker for Lake Carriers In the choice of Newton D. Baker as general counsel to succeed Harvey D. Goulder resigned, the Lake Car- riers’ association demonstrated its ability to pick a leader for this im- portant office of tried and known cali- Becomes Counsel NEWTON D. BAKER Succeeds Harvey D. Goulder as General Counsel of the Lake Carriers’ association bre. It would be difficult to think of another man acquainted with Great Lakes affairs, the equal of Mr. Baker, as a brilliant lawyer, a great public speaker and a national figure of prom- inence. He was elected to the office of general counsel on Dec. 1, 1925.