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454 MARINE REVIEW A VIEW OF THE SPACE OCCUPIED BY MARINE REVIEW AT THE MARINE EXPOSI- TION, 1925—A BEAUTIFUL MODEL OF THE GREATER DETROIT AND GREATER BUFFALO WAS EXHIBITED THROUGH THE COURTESY OF THE OWN- ERS, THE DETROIT & CLEVELAND NAVIGATION CO. with novel or particularly interesting exhibits were very well attended. These fortunate exhibitors ended up the week feeling well repaid for join- ing in a marine show this year. Others felt that though the number of visi- tors was small the individual quality was high. Still others, and they were in a minority, felt keenly disappointed in the show on the score of lack of visitors and an indifferent attitude on the part of those that did come. An off-hand impression of interest- ing features of the show would prob- ably give first place to the crankless diesel engine, described and_ illus- trated elsewhere in this issue. But it was not necessary to have a freak exhibit to draw attention, as great interest was shown for instance in the Walker propeller log, a newly invented instrument for accurately determining the revolutions per minute of each shaft and an average for all shafts, minute by minute, and also a reading of the speed in knots based on stand- ardized speed and revolutions curves. There is something about instruments for navigation of a ship that interests the engineer as well as the deck of- ficer, the designer and scientist as well as the layman. The writer no- ticed at one time in the booth of the Sperry company, Frank E. Kirby, the noted naval architect, W. B. Mayo, chief engineer of the Ford Motor Co. and Capt. Herbert Hartley of the S. S. LEVIATHAN. The Sperry exhibit included besides the regular gyro- compass a new type of bridge tele- graph, a two unit gyro-pilot, giving a combination of electric and auto- matic steering, developed during the last two years, a visible air whistle, a speed indicator giving the number of revolutions and direction of rotation, a powerful searchlight and a number of other aids to navigation. An in- teresting demonstration of the earth’s rotation was given by means of a suspended gyroscope. The General Electric Co. exhibited a finely made steam engine driven December, 1925 generating set with switchboard, a turbine suitable for driving a genera- tor or a pump, a motor of the new C D line for use below decks, a very powerful searchlight and an air mail beacon. Many Interesting Exhibits Centering around the actual equip- ment to be furnished the famous yacht Aloha, owned by Commodore Arthur Curtiss James of the New York Yacht club, interesting exhibits were displayed by three companies, This yacht is now being fitted with diesel electric propulsion. There are to be three 275 horsepower Winton diesel engines each connected to a Westinghouse 175 kilowatt generator and 30 kilowatt exciter furnishing cur- rent for a 640 horsepower Westing- house double armature propulsion mo- tor and the above and below deck auxiliaries. The Westinghouse Elec- tric Co. was thus in a position to exhibit the actual pilot house con- trol for regulating the speed of the propulsion motor in either direction from zero to 180 revolutions per min- ute, the dead-front switchboard, the propulsion motor and one of the gen- erators and exciters for the Aloha installation. The Winton Engine Co., Cleveland, exhibited one of the three 275 horsepower Winton diesel engines built for the Aloha. The American Engineering Co. exhibited the electric hydraulic anchor windlass, steering gear and boat hoists which they had built for the Aloha. It is said that the new propulsion equipment for the AN INTERESTING MODEL DEMONSTRATION OF THE WATER RAIL: TERMINAL AT CAIRO ON THE MISSISSIPPI RIVER. THIS SYSTEM KNOWN AS THE INLAND WATERWAYS CORP. IS OWNED AND OPERATED BY THE UNITED GOVERNMENT AND IS IN CHARGE OF THE CORPS OF ENGI- | NEERS U. S. A.