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32 ment of the naval architects, for the drawing of ship plant, and so on. Also they filled up about 3,000 tsubo (one tsubo equals about four square yards) in@the portion along the reef near the shore, and devoted this space to the gathering place of materials for the construction of ships. The general idea of the size of these different work shops could be gained by saying that the woodworking shop alone measures 468 ft. by 80 ft. Both at the inlet of Aku and at the Tategami, they have their own plant for generating elec- tricity for the use of the shops, as well as for lighting purposes. From there, also, is furnished all the compressed 'air that is used all over the workshops. These two docks alone at the present time, afford a facility of building 20,- 000 tons of ships per year. WRECKS OFF CALUMET HAR- BOR. The United States lake survey has received a report from Major Thos. H. Rees, United States engineer in charge of the Chicago district, that remnants of car ferry barge No. 2 have been removed, and the wreck of the schooner David Dows has been partly removed. The car ferry barge was sunk in June, 1907, 314 miles 73° 45' (ENE. 9/16 E.) from Calumet Harbor light- house, and was partly removed by the government in July and August of the same year. The sweeping oper- ations of the lake survey steamer Search in August, 1908, disclosed that this wreck was then still a menace to navigation. The wreck of the David. Dows, With a Clear depth of only 22 ft.,. lgine 634 miles 70° 30' (ENE. 4 E.) from Calumet Harbor lighthouse, was found and reported by the lake sur- vey steamer Search in August, 1908. CHICAGO NAUTICAL SCHOOL. The Chicago Nautical School, Ma- sonic Temple, 'Chicago, announces that its engineering classes during the ensuing season will be in charge of. Frank T. Clarke, an engineer well known among the marine engineers of the great lakes. Besides being an associate member of the American Institute of Electrical Engineers, Mr. Clarke has had practical experience on the great lakes for a number of years. He was first assistant engi- neces' on the "W.°E. Corey," when that steamer was' first placed in com- mission. Of recent years, he has been identified with the construction of large turbine stations in the east and west, and possesses a very com- THE MarRINE REVIEW plete knowledge of this class of ma- chinery. Mr. Clarke and Lieut. Wil- son, the principal of the school, have compiled a new set of lessons in en- gineering, greatly simplifying the course but without lessening its effi- ciency. QUESTIONS FOR MASTERS AND MATES.--NO. 17. 250. Ship heading NNEYE by com- pass when simultaneous bearings of two objects were taken by the same compass; first object bore W by N, and second object bore SSW. Deviation of this compass on NNE is 6° Wly and 8° Wly on NE by N; Var. at place Of ship 2'c" Ely. What: is the trae course the ship is making and what are the true bearings of the two ob- jects? 251. What should the bearing of the north star be by a compass having Y% point Wly Var., and no Dev.? 252. A ship making 11% miles. per hour and steering NW, took the bear- ing of a lighthouse at 9 A. M.; the bear- ing was W by N; run 22 minutes on course when this same lighthouse bore WSW. How far is the ship from the lighthouse and in which direction? 253. What is the difference in feet between 6,080 feet and the mean length of the nautical mile? 254. Explain the principle of -the log-chip, line and sand-glass. 255. How many miles and in which direction is the north magnetic pole from the true pole? What is the di- rection of the north magnetic pele from the true north pole? 256. What is the first of several cor- rections to which the compass is sub- ject? 257. Is variation of the compass a "correction" or an "error" of the com- pass? 258. Is it-correct to say that one of the errors of the compass is its varia- tion? 259. Is the variation the same at all places? ; 260. Is the variation the same at all times at the same place? 261. Does the variation change enough in several years to make any particular difference? 262. Which variation is increasing and which variation is decreasing? 263. In which direction is the line of no variation moving? 264. What is the cause of the an- nual change in the variation? ANSWERS TO QUESTIONS FOR MASTERS AND MATES.--NO. 17. 250. True course NNE &% E. First object bears W 54 N. Second object Sx W % W. Zi, NYE 252. 4.2 duies ENE from the light- house. 253. 3.2 ft. 254. A log chip is a triangular piece of wood weighted on one edge so as to float vertically and secured to the logline by a bridle. It is dropped over the stern and remains stationary in the water while the log line is being payed out. The length of line run out as timed by the sand glass gives the ship's rate of speed. The logline is 150 fath- oms long, and is marked into knots from the stray line mark, (a red rag). The speed is estimated in knots and tenths. When the logline is running out the sand glass is turned just as the stray mark passes over the rail, and when the sand has run out the logline isj held. This jerks out a plug in the chip to which one part of the bridle is se- cured, causing the log to float hori- zontally. The last knot passing over the rail indicates the number of knots run in the time the sand was running' from one compartment to another. 255. 1,200. miles south. South. 250. Variation, 257. A correction. 250. INO: 209, (No; : 260, "No, there is a. small annual change. POL Yes. 262. Easterly is decreasing. West- erly is increasing, 263. Westerly. 264. The. magnetic poles change their position from year to year. The magnetic pole is moving to the west- ward or to the right, around the true pole, Capt. D. C. Munro: of the schooner Oak Leaf, died at Gibraltar, Mich., at the age of $/ years. The Canadian steamer Rosemont, bound down with coal, went aground in Hay Lake at the west entrance to. the Neebish channel. She was re- teased after 1,000. bu, of..erain had been lightered. The steamer Milinokett, which has been laid up in Duluth harbor, has been chartered for winter storage of coal screening. .At the Berwind-White coal dock there is a great pile of coal dust which is not salable at pres- ent. The dock is already crowded and the company thas chartered the steamer to load and hold the screen- ings for the winter, hoping to dis- pose of it when work starts up next spting. Dock men say that this is the first time that a vessel has been chartered for such a purpose. a aii ed gS eine eb