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New Propeller Designed to Reduce Air Resistance HOWN in the accompanying illus- GS ration is a seven-ton propeller of new design which was recently brought to Montreal aboard the Cunard liner AtauntraA. This propeller is to be in- stalled on the Canadian freighter CoRNWALLIS by the Canadian Vickers Shipbuilding Co. This new propeller was developed by an officer of the Cunard line as the re- sult of observation of rumbling sounds in the vicinity of the propeller of his own ship. As these noises were due to the collection of air near the propeller, the new design was developed to pro- vide a means of escape for this im- prisoned air. As shown in the illustra- tion, this new type of propeller has four blades with grooves or channels along the blades through which air accumulated at the hub may find an exit. Holes are also bored through the hub of the propeller, making interfer- ence to the channels along the surface of the blades, thus enabling the air to escape at the tips of the blades. Contract for Submarine Contract for the construction of the U. S. S. CurrLeFIsSH has been awarded by the navy department to the Elec- tric Boat Co., of Groton, Conn. on a At New York Seven-ton propel- ler of new design recently developed to reduce noise and vibration. Holes in blades permit air to es- cape through channels to hub bid of $3,297,000. The submarine CurT- TLEFISH will be 1100 standard London treaty tons. The United States shipping board has authorized the sale of the LAKE GirtH to the Schuylkill Transporta- tion Co., of Philadelphia for $10,000 cash with the understanding that the vessel will be converted to a barge. Plan Three More Ships The Johnson line of Gothenburg is reported to be planning the construc- tion of three more vessels for its Pa- cific Coast-Europe service at a cost of about $2,500,000 each. The com- pany is represented on the Pacific coast by W. R. Grace & Co. as gen- eral agents. Capt. Ragnar Snobhom, formerly agent for the Johnson line at Hull, England, has been appointed special representative of the company on the Pacific coast. Bids on Engineers Equipment The United States engineer office of Wilmington, N. C. opened bids June 23 for one steel barge approximately 80 feet long, 26 feet wide and 6 feet deep. | The specifications call for a barge suit- able for transporting either fuel oil or coal and shall have at least four oil- tight compartments formed by one Bunker Prices At Philadelphia centerline longitudinal bulkhead and three transverse bulkheads. Two four- inch equalizing valves shall be located in the longitudinal bulkhead as near the bottom and as near the end bulk- heads as possible. The Marietta Mfg. Co. was low bid- der on two 34-inch steam driven side wheel pipe line dredges for the war department, bids for which were opened June 2 by the chief of engi- neers, Washington. The low bid was $442,000 for one dredge in 270 days and $850,000 for two dredges in 315 days. Other bidders included the Chi- cago Bridge & Iron Works, $1,036,000 for two dredges in 365 days; the Elli- cott Machine Corp., $1,044,716 for two dredges in 360 days; the Ellicott Ma- chine Corp., $1,044,716 for two dredges in 360 days; The Dravo Contracting o., $966,000 for two dredges in 350 days; and the Charles Hegewald Corp., $591,777 for one dredge in 540 days. The office of the chief of engineers, war department, Washington, was to have called for bids about July 1 for one steam driven stern wheel river dredge. Length overall will be 224 feet 1% inches; breadth overall, 45 feet 1% inches; depth molded, 7 feet; draft, 4 feet 1 inch. The dredge will be of the sternwheel type. There will be a 24- inch electric driven dredging pump. The auxiliaries will be driven by steam and electricity. Steam will be supplied by water tube boilers. The hull will be of all-Steel construction with main deck house also steel, and upper deck and houses of wood. Vickers Ltd. of England the parent company of Canadian Vickers Ltd. is considering the expansion of its oper- ations in the Dominion. A survey of the opportunities presented in Eastern Canada is being made by Commander C. W. Craven managing director of the shipyards accompanied by J. Reid— Young secretary of the company. Cruiser Names Announced The name of U. S. S. TUSCALOOSA to light cruiser No. 37 now building at New York Shipbuilding Co., Cam- den, N. J., and the U. S. S. SAN FRAN- cisco to light cruiser No. 38 now building at navy yard, Mare Island, have been assigned. Other Ports Coal Fuel oil alongside alongside per ton per barrel June 18, 1931.4. ot 25 May y 18 4. Diesel engine Coal Fuel oi oil oil ovens trimin bunk alongside per gallon per ton per barrel 3.841% June 18, 1931.4.85@5. .08 May 18 4.85@5. Diesel engine Boston, coal, per ton.. $7.22 oil alongside Boston, oil, f. a. s., per per gallon l 1.10 Hampton Capt re oS 1 ton, f.o.b.,piers$4.35 to 4.50 1. June 9—Cardiff, 1. A per ton | Be ; London, coal, per ton.. Antwerp, coal, per ton.. "188 6d Antwerp, Fuel oil, per ton. 67s 6d Antwerp, Diesel oil, per ton 82s 6d British ports, Fuel oil.. British ports, Diesel oil. 82s 6d 25 ..4.85@5.25 4. 25 ~ nO nN 00 00 60 ¢ an n @QOOHOOOOO sietoriae eee te > PS PPh PP WOOOOUunuun 85@5. 5@5. 5@5. 5@5. 5@5. 5@5. 5@5. 5@S. 5@5. G0 00 0 00 00 00 00 00 ¢ NKKYKNMMMY Sept. 1 4. Aug. 18, 1930.4. 30 MARINE REvIEw—July, 1931