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THE MARINE REVIEW : july, 1912 Everything that ingenuity can sug- gest for the safety and convenience of passengers is incorporated in the City of Detroit III. Passengers will appreciate the running hot and cold water which is supplied to every stateroom and throughout all parts of the ship. An automatic fire alarm reaches all departments. This alarm or thermostat consists of a small hol- low copper wire which is connected with a sensitive diaphragm or plate, the latter sounding the alarm. The wire is installed in staterooms and other sections of the steamer in such a manner that it is exposed so that a certain degree of heat causes it at once to sound an alarm. The' wire isso small that it can be placed over molding and around fancy scroll work such aS-is in the staterooms. The entire boat is divided into sections, 'eight staterooms to a section, under the plan of the new system, and when the alarm of fire is sounded an indicator or annunciator shows in what section of the boat the fire is. The wire is sensitive only to heat registering 140 degrees or more and even becomes susceptible to the heat of a burning newspaper held near it. GotHic Room City or Detroit III In addition, fire walls have been in- stalled by: which, <1n. 'case: of fire, sliding asbestos-faced doors are shoved out, confining the fire to that particular portion of the boat. The steamer is additionally protected from fire by a complete sprinkler system, leading to the freight deck, main saloon and wing passages, the water being supplied by an 8-in. Worthing- ton centrifugal pump driven by a WOOP. Perry turbine: There are four sets of McCreery. Engineering Co.'s air washers which furnish washed air to the inside state- rooms, making them as comfortable and desirable as outside staterooms, as well as furnishing it to the crew's living spaces and the galley. The Propelling Machinery The propelling engine is of the in- clined, three-cylinder, compound jet condensing type, having one high pressure and two low-pressure cylin- ders; -In design it is exactly similar to the engine of the City of Cleve- land, which has given such eminent satisfaction for the past five seasons, but is enlarged slightly to give the increased horsepower required. The Copyrighted, Detroit Publishing Co. estimated I. H. P. is 8,000 at 30 r. p. m..-The high pressure. cylinder is 62 in. in diameter and is placed be- tween the two 92-in. diameter low- pressure cylinders, all having a com- mon. piston. «stroke of &. ft..-6. in. The high-pressure cylinder is fitted with poppet valves. and Seckles cut- off gear, while the low-pressure cylin- ders have Corliss valve and gear. All the valves are operated by ordinary double bar Stevenson link motion and the cut-off in each cylinder has a range of from osyefourth to three- fourths of the stroke, adjustable from the starting platform. None of the cylinders: are steam jacketed but, together with the two large tank receivers, are well insu- lated. The pistons are of cast steel, conical and of single thickness and are fitted with cast iron spring and junk rings. The. piston rods, cross- heads, connecting rods, guide struts and crank shaft are all of the high- est quality steel forgings, supplied by the Midvale Steel Co. The crank shalt is 25 in. in* diameter in: the engine bearings and 27% in. diameter at. the outer bearings, 7114 ft. long from end to end and weights 103%