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56 British Marine Show (Continued from page 25) at least 500 pounds per square ‘inch and superheated to a temperature of 700 degrees Fahr. The turbines con- sist of high pressure, intermediate pressure and low pressure elements at 5000, 3000 and 1700 revolutions per minute respectively, driving separate pinions and coupled through double- reduction gearing to a propeller shaft at 90 revolutions per minute, giving a suitable vessel a speed of 14 knots. The North Eastern Marine Engi- neering Co., Ltd., Wallsend-on-Tyne, showed a working scale model of a quadruple expansion engine, surface condensing, of the balanced type. The original engine developed 4000 horse- power and gave the ship a speed of 12% knots, the displacement of the ship being 12,500 tons. There was also a working scale model of a North Eastern eight-cylinder marine diesel engine of the four-cycle, single-acting type. The engine develops 3000 indi- cated horsepower at 92 revolutions per minute. Samples of “perlit’” castings of which the company has bought the rights, were also exhibited. James Pollock Sons and Co., Ltd., Lloyd’s Ave., London, who is the British representative of G. & C. G. Bolinders Co., of Stockholm, Sweden, showed a model of the B. M. engine made in single, two and four cylinder types in powers ranging from 7 to 600 brake horsepower. The engines are of the two-stroke single acting type, hot bulb ignition with crankcase compression, and work on_ paraffin, residue, heavy or tar oils. This is a new model where both fresh water and air injection have been discarded by the use of a novel fuel injection device. Starting is obtained by elec- tric ignition, enabling the engine to be started from cold in 15 to 20 seconds, Marked Progress in Oil Engines Sulzer Bros., London, showed the Sulzer 300 horsepower two-cycle re- versible diesel marine engine with airless injection demonstrated under load. A vertical oil engine was exhibited by Worthington-Simpson, Ltd., New- ark-on-Trent. The engine is of the two-cycle solid injection type. The one on display was a three-cylinder engine of 225 horsepower. These engines are built in units develop- ing 30, 50 and 75 brake horsepower per cylinder, so that a great number of different sizes of engines can be built up by using multiples of these units. Vickers-Petters, Ltd., Ipswich, MARINE REVIEW showed a four-cylinder, direct re- versing marine engine of 100 brake horsepower... Engines of this type are manufactured in units of two, four and six cylinders ranging from 50 to 600 horsepower. Reversing is done by means of compressed air. The engine is fitted with electric starting apparatus which enables it to be started immediately from cold. One 120 horsepower marine two-stroke heavy oil engine was displayed by Norris, Henty & Gardners, Ltd., Pat- ricroft, Lancashire. This type of en- gine is built up to 300 horsepower; it is a 4-cylinder unit of direct revers- ing type. Other smaller units were displayed by the firm. Two Krom- hout engines were exhibited by Per- man & Co., Ltd., Fenchurch Street, London. Kromhout engines run up to 700 horsepower; the heavy models are reversed by means of compressed air. Floating Dock Launched On Nov. 10, 1925, the largest single section wooden floating dry dock ever constructed, was launched at the Brewer Dry Dock Co.’s plant, Staten Island, N. Y. A brief illustrated account of this launching was given in the December issue of Marine Re- view on page 464, the name of the builders not being known at the time. Paraffin engines with reverse gear up to 105 horsepower were displayed by Gleniffer Motors, Ltd., Glasgow, Scot- land. John I. Thornycroft & Co., Ltd., Southampton, had a large exhibit mostly connected with power boating; this firm is well known in marine en- gineering circles. In the boiler department, Babcock and Wilcox, Ltd., Babcock House, London, showed models of their patent water tube steam boilers with patent steam superheater and chain grate stoker. They also displayed a patent oil fuel burner mounted on a furnace front and arranged to work with forced draft, a crude oil engine, a totally enclosed steam winch, a Fuller- Kinyon pulverized coal conveyor, and several other appliances. A fuel economizer applied to a water tube boiler was shown by E. Green & Son, Ltd., Wakefield. Clarkson Steam Mo- tors, Westminster, London, showed examples of their patent thimble tube boilers developed for waste heat re- covery from diesel engines and fur- naces. The Yorkshire Copper Works, Ldt., Leeds, are tube specialists, and the central feature of their exhibit January, 1926 consisted of a pyramid built up of cupro-nickel condenser tubes. The increasing use of fuel oil in ships has developed the manufacture of oil purifiers and separators. Vickcen separators were displayed by British Separators, Ltd., Queen’s Road, Peck- ham, London; the range of machines shown was from 10 to 2000 gallons per hour. It is claimed that the lat- ter machine can deal with over six tons of diesel fuel oil per hour. The exhibit included a Vickcen separator specially enclosed for the treatment of fuel oil on board ship. A De La- val centrifugal oil purifier was shown by De Laval Chadburn Co., Ltd., Wel- lington House, London. In the De Laval closed or funneless system the fuel oil is not exposed to the atmos- phere but is led to and from the machine through closed pipes, and sight glasses are fitted for observa- tion purposes. Chadburn’s_ (Ship) Telegraph Company’s naval and mer- cantile telegraph installations were displayed at the same stand. Many Types of Auxiliaries R. C. Knight & Dunford Smith, Bishopsgate, London, exhibited their conduit patent oil separator. Its ac- tion is continuous and automatic, and its capacity ranges from 10 to 200 tons per hour. Super-Centrifugal Engineers, Ltd., Aldwych House, Lon- don, displayed several models. of Sharples oil purifiers. One type which had not been shown previously is totally enclosed, fumes and gases are carried to deck and the oil that remains in the bowl of the centrifuge when the machine stops drains auto- matically to the fuel oil bunkers. One portable type was shown in operation. An Iwel steam turbine centrifugal oil filter was exhibited by Industrial Waste Eliminators, Ltd., High Hol- born, London. Between 20 and 30 exhibits dis- played pumps, refrigerating machin- ery, compressors, and other equip- ment. Pumps were shown by Zwicky, Ltd., Slough, Buckinghamshire; Sul- zer Bros., Boulton & Paul, Ltd., Nor- wich; the Aster Engineering Co., Ltd., Wembley, Middlesex, who also showed a new type of feed water regulator. Stothert & Pitt, Ltd., Bath, displayed pumps and Burn’s patent gears. Elec- tric ship’s winches and steering gears were exhibited by Laurence Scott & Co., Ltd., Norwich, A refrigerating plant for cargoes and docks was ex- hibited by John Davies Insulating Co., Ltd., Liverpool, H. J. West & Co., Ltd., London, J. & E. Hall, Ltd., London. Air compressors were shown by Hol- man Bros, Ltd., London, who hold the rights of the Hele-Shaw Beacham