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OF BATTLESHIP NEBRASKA. The report of the Board of Inspec- tion and Survey on the official trial of the battleship Nebraska, built by Moran Bros. Co. Seattle, Wash., has just been filed with the navy department at Washington. The board inspected the Nebraska on July 14 and embarked on her for the trial on July 16 over the Vashon island measured mile course. Just previous to the vessel's starting on the standardization runs, the draught was taken, and found to be: TRIAL Borward. 45 3. 55 Gi ces 23 ft. 105% in. AE re is Pee 24 ft. 05% in. MOAR eo aes 23 Tt. :1ise in, Corresponding displace- ihent i. a ee 14,985 tons At 8 H. 59 M: 40 S. a. m., July 16, 1906, the Nebraska commenced her standardization runs, finishing at 12H. 40-M. 00 S: pi m. During her trial the weather was overcast and misty, with light. breeze from the south (mag.). Smooth sea. 12, The board -constructed the speed curve appended, marked "C," from the following data: * Number Interval Average Mean Speed and between ofelapsed revolu- in direction middle times tions per knots © ofrun. ofruns. ~ observed. minute. M.S meeys: 1N 3207.8 1212710. 19.169 28 24 58.7 3705015 122.639 19.444 3 N 21 21.4 3 08.83 124.078 19.063 4s 22 22.8 3 04.35 119.389 19.528 5 N 21 39.3 3 12.95 125.372 18.658 -- 6S P5o5a07 3 00.4 124.296 19.956 7N 10 54.6 3 19.63 115.729 18.033 8S Ele 254 3 03.8 119.975 19.587 9N 11-5152 32250 111.228 17.795 10S 14 08.4 3 29.0 98.849 17.225 11 N 16 18.0 3 34.1 104.060 16.815 1228 17 26.9 3 28.8 100.157 17.241 13 N 16 01.4 70.91,6 92.563 15.544 Note: The data "from which this table was constructed is given in the appended table marked "D"'. The results of the runs with and against the tide having been plotted as separate curves, the curve of true speed was obtained, from which it is deduced that a mean of both engines of 119.85 revolutions per minute is requisite to a true speed of 19 knots. After the standardization trial was completed, the draught was found to be: Goran 6 es a 23". 656" Be en ~.-23 10% Meee eae as ay Sx" Corresponding displacement. . Mean draught at time of mid- dle of "high speed" runs..23' 11" (est.) Correspond:ng displacement. . -14.940 tons The board disembarked at 4 p. m. The board embarked on the Ne- brasxa at Seattle, Wash., at 7:30 a. m., July 17, 1906, and that vessel got under way immediately and stood out into Puget Sound for the four-hours' trial. On the morning of July 17, 1906, the draught was taken before getting - full-power trial and while .14,815 tons © "TAE Marine. REVIEW under way for the four-hours' trial and found to be as oe Forward Aft speed Mean Corresponding displacement. ..14,975 tons At.6 H. 28-M. 40.5.5.-4. in, Joly a, 1906, commenced the four-hours' trial, as prescribed by contract, the ship steering N.W. to West (mag.). The weather was overcast and _ cloudy, with light. breezes from south. Sea Re ee ee 23° 11 7-16" 17 amidships, the engines were reversed; and when making 60 revolutions. per minute astern, the vessel was allowed to gather stern board for two min- utes; the helm was then put 15-deg. starboard, then 25-deg. port, then 30- deg. Starboard. thea 35dee. . port; then 35-deg. starboard, and allowed to remain at each of these angles for two minutes. The helm was then put amidships. During the above tests, the general smooth. At 42 H. 28 M. 40.5 Sp. m., - operation of the. steermme gear was finished the trial. The data follows: satisfactory. Total revolutions Average Correspond- Hour of Elapsed Each 15-minute period 'revolutions ing speed e : per min. by day time Stbd. Port Mean both revo- h. me as h,_ min. engine. engine. revolutions. engines. lutions. the . 8:28:49.5 - nee (Beginning of rut). 2 3 fae. ee Skee, 8:43 :49.5 00:15 1822.3 2179326 1807.95 120. 530 19.070 8:58 :49.5 00:30 183253 1784.5 1808.4 120.560 19.071 9:13:49.5 00:45 1841.8 18115 1826.65 L274 19.181 9:28:49.5 1:00 1843.3 1799.0 182115 121.410 19.140 9:43 :49.5 Le15 1854.4 1823.6 1839.00 122.600 19.257. 99:58:49.5 1:30 1845.1 1800.0 1822.55 121.503 19.160 10:13:49.5 1:45 1832.0 1788.5 1810.25 120.683 19.080 10:28:49.5 2:00 1851.0 1766.9 1808.95 120.597 19.072 10:43:49.5 2ak5 1810.7 1753.6 1782.15 118.810 18.905 10:58:49.5 2:30 1812.2 1752.0 1782.10 118.807 18.904 11:13:49.5 2:45 1823.7 1748.4 1786.05 119.070 18.930 11:28:49.5 3:00 1845.6 1790.4 1828.0 121.867 19,190 11:43:49.5 3215 1838.3 1783.3 1810.80 L207 2052 19.085 11:58:49.5 3:30 1826.05 1771.4 1798.72 119.915) = 19, 012 . M. Ro tare t 12:13:49.5 3:45 1826.05 1771.4 1798.72 119.915 19,012 12:28:49.5 4:00 1821.8 1769.7 1769.7 119.717 : 18.990 Average revolutions per minute, 120.49; corresponding speed from curve, 19.06 knots. As the vessel made a straightaway. run, it was not possible to obtain her draught when the trial was pleted, but it was estimated that the draught at the middle of the four-hours' run was 23 feet 97-16 inches, and the corresponding displacement 14,865. tons. After completing the four-hours' -the vessel was. still under forced draft, the steering gear was tested in the fol- lowing manner: hard a-port (35 deg.) in 10.4 seconds; the time to swing her through 360 deg. with full helm was 3 min. 40° seconds. The helm was then shifted from hard-a-port to hard-a-starboard in 16.8 seconds by the bridge indi- cator. The helm was then put amid- ships in 84 seconds. The 'maximum heel was 3 degrees, and the estimated -- diameter of the turning circle was 350 "yards. After completing the above tests of the steering gear, the helm was put amidships, and after the vessel had gathered full headway on_ her course, the steam-reversing gear of the main engines was reversed, the engines being started astern, and after they began to work astern at full speed, they were brought to full speed ahead. After the fires had been reduced sufficiently to keep the steam pres- suré under control, the helm being com- - 'ordnance The helm was put ' boilers, The Nebraska then proceeded to Seattle, Wash., and a board disem- barked at 7:30 p. m. The report of the naval constructor member of the board, and the. report of the board on the trial of the ma- chinery, are appended, marked ie? and "F" respectively. Certificates from the equipment and inspectors' at the contrac- tors' works, relative to unfinished work on the Nebraska in their respec- tive departments, are appended, marxed "G" and H.2 S3 The weight of machinery, including water in the boilers, condensers, etc., in accordance with clause 10 of the contract, is shown by the report of the inspector of machinery at the contractors' works to be 1,681 tons. The working of the machinery, both main and auxiliary, and its per- formance during the trials was satis- factory except the priming of boilers caused by leaky tubes in main con- densers. The boilers steamed freely and worked in a satisfactory manner throughout the _ trials, except the ° priming of same. A careful observa- tion and, inspection of the various parts of the maehinery during. and after the trial showed the engines, and appurtenances to be in excellent condition, with the excep- tion of defects noted in the report of | the board on the trial of the machin- ery, appended hereto. .