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wardly through the 'tubes into the tubes M, and thence into the firing tubes in the fore part of the vessel. Other torpedoes are then lowered and moved rearwardly into the after firing tubes, and finally the last torpedoes are lowered into and allowed to re- main in the loading and storage tubes, the operation being exceedingly sim- ple and, it is claimed, brief in accom- plishment. The torpedoes in the after tubes are examined in the rear hatch by first withdrawing the torpedoes inthe load- ing and storage tubes into the conning tower, and then by opening the inner caps of the after tubes, the torpedoes may be withdrawn and their rear ends inserted into the loading and storage tubes and examined as they are moved forwardly into the tubes, after which they are replaced and the torpedoes previously withdrawn from tthe stor- age tubes into the conning tower are replaced, having in the meantime been examined in the conning tower. This operation is also performed with re- spect to torpedoes carried in the for- ward tubes. When a torpedo has been discharged another may be readily in- serted in its place from the storage tube, held in longitudinal alignment with the tube from which 'the torpedo has been discharged. While the construction and arrange- ment of firing and storage tubes are shown, the details of the firing mech- anism and means of securing the tubes in position are omitted, as any suitable method may be employed, the inven- tor making no claim to such details. VENTILATOR FOR MOTOR BOATS. | The accompanying illustrations show a combination protective awning and engine cooling apparatus for motor boats. The distinguishing feature of this invention is an overhead air scoop, open at the forward end and closed at the after end, said air scoop being connected by a suitable conduit with the motor crank chamber when the boat is propelled forward. As a result, not only is the roof kept cool, but also the motor crank chamber, the latter being ventilated and having all objectionable odors carried off. Fig. 1 is a sectional view of a motor boat showing the apparatus in position. Fig. 2 shows a front eleva- tion, on a larger scale, of the air scoop, and Fig. 3 a larger sectional view of the scoop. The motor boat may be of any construction, provided with kerosene or hydro-carbon motors having the cranks enclosed in a com- mon chamber, said chamber being "TAE MarInNe. REVIEW sealed with the exception of the air in- let and outlet conduits. This inlet conduit connects with the rear portion of the air scoop, the outlet discharging to the atmosphere. The top of the scoop is preferably though not neces- sarily convergent, its rear being closed and its forward end_ being closed in part by a dashboard in which is formed an inlet aperture, preferably closed, circular, this aperture being except when the boat is propelled for- ward, by a flapper or door hinged to swing inward. A gutter extends across the floor of the scoop, or air receiver, for the purpose of collecting and disposing through a drain of any water resulting from rain or snow admitted through 'the opening. The inlet conduit is provided with a valve for regulating the flow of air to the crank chamber. The inventor is Abbot Augustus Low, St. Lawrence county, N.Y. FEED WATER HEATING. Marine engineers will be interested to note the publication of a new and complete catalog of steam special- ties by the Griscom-Spencer Co. of 90 West street, New York City, formerly the James Reilly Repair & Supply Co. Probably few names are better known in connection with the manu- facture of marine feed water heaters than that of the Reilly Co. The Reilly multicoil feed water heater is one of the best known feed water heaters in the United States and has for many years been regarded as such on the Atlantic seaboard. Its introduction into the great lakes dis- trict has been more recent, but such installations as have 'been made have shown the same remarkably high effi- ciency and the heater 1s arousing much attention among the lake engi- neers, where hitherto the straight tube heaters have been in general use. The _ of heaters, : 7 a catalog explains in detail the scien- tific theory embodied in the use of a large number of small-diameter cop- per tubes, coiled helically on a small radius, whereby the violent agitation So necessary to the efficient and rapid absorption of heat in a closed heater is secured in the highest degree. This catalog is of more than usual interest and value by reason of the rules and tables it contains, showing the calculations and results to be se- cured from the installation of feed water heaters. These tables are fig- ured for several different kinds of steam plants, for different values of coal and for various initial tempera- tures of feed and show the remarka- ble yearly cash savings per horsepower of main engines effected by the use The catalog also contains an interesting discussion of the vari- ous phases of the feed water question and the information. will be of much value to any engineer as a guide for determining the selection of the feed water heaters. The catalog also describes briefly the other well-known specialties of the Griscom-Spencer Co, The Reilly multicoil evaporator is designed especially for use on ship- board for distilling sea drinking purposes, and boiler feed. The Reilly multicoil condenser, to be used in conjunction with the evap- orator. for makeup water, for The Reilly water filter for rendering distilled water sweet and palatable.: The Reilly grease extractor feed water purifier and filter for removing oil, grease and other impurities from feed water. The catalog is elaborately illustrated with half tones and diagrams. Copies will be sent upon request. Maj. J. C. Sanford, government en- gineer, 815 building, Philadelphia, opened bids a few days ago for constructing a steel, twin- screw suction dredge for Galveston harbor. The bidders were: Maryland Steel Co., Sparrow Point, Md., $357,- 500, delivery in nine months; Fore Ship Building Co. Quincy, Mass., $384,500, delivery 9 months, 15 days; New York Ship Building Co., Camden, N. J., $410,000, delivery 12 months; Newport News Ship Building & Dry Dock Co., Newport News, Va., $412,000, delivery in 11 months; Wm. Cramp & Sons, Philadelphia, $499,500, delivery in 12 months. Witherspoon River