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"34 room which is entered through pilot house. : The vessel is equipped with an 80- horsepower three-cylinder Atlas ma- tine gas engine, 10% x 12, turning 280 revolutions. The Atlas auto type steering gear with engine reverse and steering gear led to one stand in the pilot house is used. The forecastle is used as a boats- wain's locker and has no berths for crew. There are combination berths and seats in the pilot house and a berth in the engine room. ihe keel is Gf pine and the, shoe of ironbark. The stem and sternpost are or oak, Frames are of pine spaced 14 in. centers and: 10% in. under engine. The deck beams are of pine with 28-in. centers. The vessel is equipped with a 6-in. Dow centrifugal pump driven by means of friction with the main fly- _ wheel. Wheeler Shallow Water Alarm Editor Marine Review :--Your est in everything concerning naviga- tion prompts the writer to send you a description of the Wheeler Shallow Water Alarm and the results obtained on the steamer Quincy A. Shaw inter- TAE MARINE REVIEW January, 1912 Fic. 2--Atr COMPRESSOR AND TANK is made of metal or rubber hose hav- ing a half-inch bore and has a stream of air forced through it coming out at the bottom: <The air pressure through the line comes from the air compressor and tank, as shown in Fig. 2. Around this hose or tube is a wire afmor having, a strength of about seven tons. This armor is pro- ic. 1--SHowInc THE SouNpDING LINE WouNp oN THE DruM during the past season as a sounding machine. It is a new invention to obtain a continuous depth of water by means of registering in the pilot house the water pressure 'at its vari- ous depths. The means by which the depths are obtained are simple and as follows: Fig. 1 shows the sounding line wound on <its drum. The line tected from wear by chilled iron rings. The present total length of the line is 330 ft. and weighs a little over a half a ton. The available length of line below the bottom of the boat is 2a ft, and with this out at a speed of 12 miles per hour the lower enc. will drac at a denth.of 77 ft. when loaded to a draught of 18 ft. Therefore the depth under the keel at full speed is always shown if it does not exceed 77 ft. At about half speed the line drops and shows a depth of 115 to 120 ft. and the depth gradually increases as the speed of the boat decreases, the depth of the line in this way in a measure indi- cating the speed of the boat. Fig. 3 shows' the gages or indicators on the pilot house. The large gage indicates the depth by the pressure being trans- posed into feet or fathoms. The smallest gage shows the pressure on the air tank, "Phe other 'gage 'carries the pointer for the electric alarm bell. This bell an alarm to approaching can be = set "to: "sound ring at any depth when' water of less depth than is shown on the indicator. We dragged the present line through the rivers and lakes for six trips and it seems to, show <but little wear. It traced the soundings through the rivers and we frequently proved the accuracy of the machine by casting the hand lead line. At no time did the line catch in dragging it over the bottom to damage or effect its usefulness. The machine picked up the shoaler water on our courses through the lakes and especi- ally the various shoaler places through the Straits of Mackinaw and Green Bay. We often picked up shoaler places than are indicated on the charts. The shoaler water to the northward or Crisp Point, Lake Superior, was invariably picked up on our course from Manitou Island to Whitefish Point. When the sounding machine did not pick up this shoaler water, we found on making Whitefish Point