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30 REPAIRING A PROPELLER WITHOUT RESORTING TO A DRY DOCK. The feat of replacing a broken pro- peller blade of a 4,000-ton steamer without resorting to a dry dock was recently accomplished by the Gaw- ley Foundry & Machine Works, Ta- coma, Wash. The work was exe- cuted in as short a time as it could have been done in a dock, and at a THe Marine REVIEW rigged; the damaged blade was re- moved and the new one set in its place. == The job occupied 25 working hours and except during the time the heavy blade was being handled, when five men were required, only two men, a machinist and a helper, were em- ployed. The repairs cost $1,000 and were executed under the direction of Mr. REPAIRING THE PROPELLER OF THE Cot. FE. L. Drake WITHOUT THE USE OF A Dry Dock. cost actually less than that asked by other firms wth dry docks at their disposal. The repairs consisted in removing the broken blade, taking out the broken studs, refitting the new 'blade and new studs and trimming and straightening the other three blades of the propeller of the Standard Oil Co.'s tank steamer Col. E. L. Drake. The blade was broken in a terrific gale encountered iby the Drake on her last trip from San Francisco to Puget Sound the week of Feb. 15. The repairs were made Feb. 22 and 23. To make the repairs the steamer was towed up the city waterway at Tacoma to a point opposite the Wheeler and Osgood waterway, not " far from the Gawley Co.'s plant. Here . the vessel was securely moored. All possible weight aft was removed for- ward and enough water was pumped into the fore-peak and fore hold to weight down the bow and life the propeller half out of the water, When in this position a barge was brought along the starboard side and moored close to the propeller. Tackle was G. Wallace, marine superintendent of the Gawley Foundry & Machine Works. The Gok Bok. Drake is a. steel tank steamer owned 'by the Standard Oil Co. Her registered tonnage j; 4,205 gross and 3,307 net. s She is 360 ft. in length and 50 ft. beam. Hep engines are triple expansion 25, 41y, and 68 in. in diameter by 42 in. stroke. She was built in 1903. A PROPELLER DAMAGED In ARCTIC ICE, We are privileged to reproduce here- with some interesting photographs of the damaged propeller of the United States revenue cutter Thetis. The Thetis cruises annually in the Arctic ocean along the northern Alas- ka coast, leaving Seattle in Abril or Miay and returning in November. In July, 1908, the cutter encountered un- usually heavy 'ice in the north, in con- tact with which the propeller was damaged. One blade was bent back- ward 180 degrees, the other forward about the same amount and the end of the third was broken off. The pe- culiar feature of the whole matter is that with the propeller damaged in this manner the Thetis steamed 4000 miles at no apparent decrease in speed or decrease in the efficiency: of the propeller. The only change noted after the accidént was a. slight increase in the revolutions of 'the en- gine; the speed before the damage was 70 R. P. M. and afterward it was frome 72 to. /o. Ro PM: The damaged wheel is bronze, 12 ft. in diameter, 14 ft., 6 in. pitch, with a thelicoidal area of 37 sq. ft. The com- position of the wheel is as follows: Copper 88 per cent, tin, 10 per cent, zinc, 2 per cent. As the photographs testify, this bronze is very tough and ductile and is a mixture that can be recommended for wheels that are sub- jected to hard usage. PROPELLER OF REVENUE CUTTER TuHetTis DAMAGED IN ArcTIC SEA.