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gee interval. It was required that the boiler pressure be not reduced to such an extent as to cause priming. The results are shown in the follow- ing table: THE Marine REVIEW Her tow of the same length but with 1. ft. more of beam, carrying 50 tons of cargo and about three score _of passengers, was firmly lashed alongside, her bow projecting about 10 ft. ahead COMPARATIVE BACKING DATA, CHESTER, SALEM Speed in Knots. Mean coe 4 a se a See Th OU ito 19's" gr" ag 4,950 "4,877 4,855. ee eae ka ee 9 a9 2" 4842 4,846 4,851 oe 95.00 vit 19' 4" 19" 7" 19' 6" 4,785 4.846 4,835 Sa et 19° 4" «197 7" ~--s«197 6" "4,785 «4,846 ~=-- «4,832 1 1 run 1 run : : : "Time to sans from instant of signal Distance head reached in ship _ for reversal. q lengths. a CG. Ss. rie C. Ss. ' M.S. M. S. M. S. 1452.7. 1:20.4 1:10.3 ae 1.8 1:5 2:06 L273 121.2 4.3 3.0 -- 2.6 2:08.5 Lea? 103 5.4 4.2 3.0 2151 1:40.5 1:09 6.5 4.7 Sie AND BIRMINGHAM. It will be noted that at all speeds the reciprocating engine provides bet- ter backing power than the Curtis tur- bines, and that the latter is superior to the Parsons turbine. The average time required for re- versing, and the fall in boiler pressure during the backing interval were as follows: Av. time Av. drop in to reverse, boiler pres- in secs. sure, lbs. Parsons turbines .... 8.2 82.4 Curtis turbines ...... 39.2 75.8 Reciprocating engines.. 5.1 None In the case of the Birmingham, the average boiler pressure at the end of the backing interval was 1.5 lbs. great- er than at the beginning of the inter- val, The Shutung's First Voyage The maiden voyage of the Shutung, a twin-screw tug, built by Messrs. John I. Thornycroft & Co., for the navigation of the Yangtse rapids, has created quite a sensation in the Chinese press, the vessel having towed a passenger and cargo flat of approximately her own dimensions, built by the same firm, up the rapids between. Ichang and Chung- king in one-third of the shortest time hitherto required for the journey. Below are given extracts from the re- port as it appeared in the North China Daily News. "We have just witnessed a scene of intense excitement and rejoicing over the safe arrival of the Szechuan Steam Navigation Co.'s steamer Shutung from Ichang. The difficulties, which were legion, including the opposition of the Viceroy in Hupeh, have been patiently overcome, and the Shutung reached Chungking safely. The powerful little steamer, only 115 ft. long and 15 ft. beam, made the journey of 500 miles against a fall in that distance estimated at 500 ft., without a hitch of any sort. of the steamer's bow. Like Siamese twins--the two practically one--they (or she) came all the way under the Shut- ung's own steam. It was not found necessary at any of the rapids to sep- arate them and haul up the tow by a hawser. "As the river still keeps high, the Ching and the Hsinloong rapids were in their easy condition. The Yaochaho, that 14-mile stretch of rocky wilderness between the Ichang and Niukanmafel gorges, gave a good deal of trouble, especially. ,off the Peitungtze and Tutan rapids,..whére considerable seas were shipped over the fore decks. The Yeh- tan also gave trouble. Twice the force of the current and the slope of the rapid were too much for the then pressure of steam and the twin ships drifted backward. After cleaning the fires, an- other attempt was made, and this time successfully. "All the other difficult places were navigated without trouble, except the Futan, a little above Wanhsien. Here a rise of water had brought the river to danger level for that rapid, the perpendicular rock wall on the left bank being awash. For a few moments it was 'touch and go.' But at the right moment the call for another pound or two of pressure was promptly responded to by Chief Engineer Brandt, and the 'Twins' just managed to weather the point. "Chungking is practically three weeks to a month distant from Ichang by junk for passengers and from a month to two or even three months for cargo. The Shutung has made her first trip up against a strong autumn current in 65 (steaming) hours. She should make the down trip to Ichang in less than half that time. "If such a successful journey can be made on a first and trial trip, how much we may look for when every hand is a tried and experienced one. The vessel has proved a great success, and she re- ceived a great ovation." August, 1910 In writing of this first performance, Capt. Plant (the marine superintendent of the Szechuan Steam Navigation Co.) gives one or two interesting details. The following is an extract from his letter: "The tugboat Shutung with her flat made the maiden voyage through the rapids and gorges to Chungking in per- fect safety during the latter days of last month. The little vessels maneuy- ered admirably all through the turbulent swirling waters--the flat towing along- side--and reached Chungking in seven days from Ichang, a distance of 400 miles, that has occupied from 30 to 50 days by native craft. "We experienced no trouble at all with the engines throughout the whole journey, though the strain on them at times must have been severe on account of the racing of the propellers in the violent swirls below the rapids. We kept 140 Ibs. pressure easily and con- stant, with the local coal, and engines working at 300 revolutions; but we found some difficulty to keep pressure when the engines were opened full out at the crossing of the rapids, that is with 325 to 340 revolutions. "We experienced no trouble whatever with our boiler or auxiliary engines, and found no difficulty in keeping a good water level in our boiler. We hardly ever used the fan engine; the natural draught was quite sufficient. We averaged a mean of 6 knots over the ground throughout." Terminal at Port Lobos The Robbins-Ripley Co., engineers and contractors, 50 Church street, New York, have just completed plans for the deep sea terminal of the Ari- zona, Mexico & Gulf of California railroad at Port Lobos, Mexico. The terminal consists of a trestle approach 2,000 ft. long, a pier partially shed- ded, 500 ft. long, with a sufficient depth of water to take care of the largest sea-going vessels. The Ripley combination piling is to be used throughout the entire struc- ture for the prevention of the rav- ages of the toredo, which infest the Waters Of: the gulf of California. -It is expected that after the completion of the Panama canal that Port Lobos will become an important outlet of products, mineral and otherwise, of Arizona and New Mexico. The New York Ship Building Co., Camden, N. J., announces that Ed- win B. Sadtler has been appointed agent in charge of its New York office, No. 12 Broadway.