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T'wo Bucket Dredgers The Collinwood Ship Building Co. Constructs the Largest That Have Ever Been Built in Canada for the Dominion Government ac Collingwood Shipbuilding Co., Collingwood, Ont., has completed two powerful bucket dredgers with central well for the Canadian government's department of marine and fisheries. These vessels are the largest of this type ever built in Canada and are intended to operate in the St. Lawrence Ship Channel. The principal dimensions are as fol- lows: ft. in; Riermath,. "B.. Poo... caged 215. 0 Breadth; moulded ...... 378 Depth, moulded 2.20. 14 0 They are built under Lloyd's special survey to take 100-A.1 dredger class and under government inspection. The dredging gear and propelling machin- ery are of exceptionally heavy design in order to cope with the hard pan and rock which is encountered in many parts of the St. Lawrence river. The ladder is of very substantial con- struction, 117 ft. long and arranged to accommodate a chain of forty buc- kets,.each of 27 cubic ft. 'capacity. The buckets have cast steel backs, heavy boiler plate bodies and man- ganese steel lips, and each one is pro- vided with four heavy cutting teeth with tool steel points. The bucket links are forged and the pins and bushings are manganese steel. The tumblers are of cast steel, the bottom one being six-sided and the top one five-sided. To stand the wear and tear, the bottom tumbler shaft is fitted with a hard steel liner and a manganese steel bush in halves. When the ladder is at an angle of 45 deg. the dredge can dig to a depth of 52 ft. below the water. level. The propelling machinery consists of one set of triple expansion, surface condensing engines of the Colling- wood Shipbuilding Co.'s make, with cylinders 15 in.; 25 in. and 42: in: by 26 in. stroke. A clutch is arranged between the crank shaft and propel- ler in order to disconnect when the vessel is digging. Forward of the engine a heavy change speed gear arrangement is fitted, having a double clutch so as to give two speeds on the chain of buckets, the low speed being 10 to 12 'buckets and the high speed 18 to 20 buckets per minute, the latter speed being intended whea dredging in soft material. The verti- cal shaft driving the top gears and surge wheel is 11 in. diameter, and all the gears and pinions are of cast steel. The surge wheels are each 15 ft. 6 in. diameter, the outer rim having double eae ws ae SHELVE PAINT ano LAMp Roon. 5 RES. SE p Ro PROMENADE OFFICERS COS o SIOE BOARD. hellical teeth. The friction is ar- ranged by means of brass faced cod pieces and tightening screws. The boilers are of the usual marine type, two in number, 11 ft. 6 in. dia- meter by 10 ft. 6 in. long, fitted with Howden's forced draft, and arranged to work at a pressure of 180 lbs. per square inch. A very complete installation of en- gine room auxiliaries has been fitted, and comprises a 10 in. by 20 in. by 10 in. vertical monotype air pump, one pair of direct-connected feed pumps 7.in. by 5 im. Dy, 1b: im, ome vertical duplex general service pump 714 in. by 434 in. by 10 in., one 6 in. centrifugal circulating pump, two vertical simplex bilge pumps 6 in. by 5 in. by 10 in., two vertical duplex sanitary and feed water pumps 4% in. by 4 in. by 5 in, one G. & J. Weir's surface feed heater, one See's ash ejector in each boiler room. A com- plete electric installation is fitted, two 11 kilowat machines being installed, either one of these being capable of handling all the lights aboard the vessel. A 24 in. diameter searchlight of 25,000 c. p. is fitted on the shade deck aft for use in reading draft gauges on the river at night. A 60 in. Howden's fan is fitted for supply- le ekos ']] QRAWERS UNDER. MESs. LIGHT xg AIR. TRUNK Se ro ENGINE ROOM. DECK OF CANADIAN BUCKET DREDGER