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LA APSE A hn = = $55.00. 270 of the machinery parts in pounds per indicated horsepower. Engine complete, including fly wheel and reverse gear....... 158 Producer, lining, scrubber, and water in apparatus...... Coes 1 BO Pumps, auxiliary engine, and GtHer parte. 06. 560205. iss 15 Wipe 00 ies se es Wis. one Oe uel in producer: .....<. : groees 13% MOLAL? HSS cs es Piet vee oe O89 per 1. Bp. These weights, it is claimed, could now be considerably reduced. The weight of a triple-expansion steam engine of the same indicated horsepower would be: Prngine 4.53 3% Meet ees ites 198 POMC ae ee atc ec ese. + 176 Auxiliaries and piping........ «60 Water in boiler. <5 0. so06.3 6. 02 OMA ac ie yes ea ewes 496 lbs. i. h. p., which is said to be a fair average. It therefore appears that the marine producer gas engine plant is 20 per cent lighter than a steam plant of the same indicated horsepower and requires less room. The cost of the gas plant is about 10 per cent greater than that of the steam plant. The suction gas tug Deutz had by Sept. 20, 1909, or about three months after its first start, already made 12 'round trips, or 1,200 hours of towing, which speaks well for its reliability of operation. The tug can average 3% miles per hour against the river current with two loaded tow boats with a total paying cargo of 3,200 tons. The tug with its tow makes a round trip in a little over 100 hours. Including coal used by auxiliaries and coal used during layovers, it averages 550 Ibs. of lignite briquettes per hour. This average is for 719 hours' run, and includes all coal. burned during this time. At a cost of $2.16 per long ton for the briquettes, the fuel cost- for the round trip is 100 X 550 X 2.16 A barrel of 2240 lubricating oil containing 50 gallons is used each round trip. The crew for 16 to 18 hours, consists of captain, wheelsman, machinist, helper, one or two laborers, and a sailor, or six to seven people in all. The attention to the producer consists principally in coaling, which is done by raising fuel by the bucket, using a winch, which is arranged to make it easy to drop the coal directly into the producer. There are two such lifts, one each for the port and starboard bunker. The fire is coaled every half hour, using one bucket from each side. Every two hours the grate is shaken a few times and every eight hours the fire is clink- ered- This work is done without dust or dirt. E It is true that a steam plant of the same rated power can carry an overload occasionally, or even steadily, but. this THE MarRINE REVIEW is at the expense of fuel economy. A steam plant cannot hope to use less than 214 to 3 times as much fuel for the same work under the most favor- able conditions, and when driven beyond its rating, it smokes badly and the fuel economy is even worse. The gas plant has the advantage of being absolutely smokeless, and to permit forced driving, which has grown to be a custom, the rated power should be fixed with this consideration in view. The gas power tug is said to have surpassed the expectation of the builders in every respect, and while no doubt considerable work is still required to perfectly adapt the design of the power plant to the various kinds of marine service, the foundation of success has been assuredly laid. We may look for- ward to seeing on all our rivers within a few years clean and smokeless pro- ducer gas power boats operating with an economy and efficiency formerly un- attainable. LAKE STEAMER THOMAS J. DRUMMOND. Archd. McMillan & Son, Ltd., Dock- yard, Dumbarton, Scotland, who have now constructed a large number of vessels for the Canadian lakes of both the bulk carrier and package freight type, have just completed an addition July, 1910 44 ft.; depth, 26 ft.; is built to British Corporation survey, with scantlings entitling her to trade in any waters, and is specially designed for carrying rails and bulk cargo, her arrangements being such that these may be handled with the greatest possible facility. The hold space is divided into three com- partments, and extra strength is intro- duced in the structure of the vessel where additional strains are likely to be experienced when engaged in her special trade. A cellular double bot- tom of extra depth over rule require- ments, and fore and after, peak tanks, are arranged for carrying: water bal- last. Her deck machinegy, including winches, windlass, and capstan, is all arranged for the speeg and easy handling of the vessel.ze The steam steering gear is on the Wilson-Pirrie principle, working direct on to the rudder quadrant--the rudder being of the usual 'balanced lake type, and fitted with coupling to permit of easy re- moval. A large coal bunker is fitted on deck as well as bunkers alongside boilers, all arranged so that trimming can be practically dispensed with. Electric light is fitted throughout the vessel, including holds. Accommoda- tion is provided in the forecastle for- ward for mates, wheelmen, watchmen, THe Britisu-Buirt Laxe FreiGHter THOMAS J. DRUMMOND. to the fleet of The Algoma Central & Hudsom Bay Railway Co., in the steamer Thomas J. Drummond. The vessel, which is of the single deck type, is named after the president of the company, and is of the following dimensions: Length, 248 ft.; breadth, ' and deck hands; a suite of rooms with bathroom are arranged for owner, while the captain's accommodation, in- cluding bedroom, bathroom, office, and chart room is arranged in Texas house on top of forecastle. A wheel house is fitted on top of Texas house with