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the work amongst the boilers in use that would conduce greatly to econ- omy of steam production, to the main- tenance of a regular speed, to the life of the boilers, and to the peace of mind and comfort of the entire engi- neering personnel. We hear of spe- cial courses of instruction for every special class of men in the service except those who have to do with the motive power. When the conditions of the service will permit, special in- struction on special ships should be given in firing and the rudiments of chinery. 'TAeE Marine REvIEW engine driving and the care of ma- If as much thought were given to firing boilers as to firing guns the results would be little short of amazing; but lacking these Utop- ian conditions, much may be accom- plished by seagoing officers with the material on board. The adoption of any sort of a system of firing, by the increased regularity and economy in the production of steam and the gage it affords on the abilities of the men, will amply repay the slight ef- fort needed to put it in operation. The Dake Steam Turbine. The accompanying illustrations show a new turbine, in which the steam is made to repeat its action upon the buckets of the same wheel, as in the FIG. 1--RING OF MOVABLE BUCKET. Riedler-Stumpf type. This turbine is the invention of Chas. W. Dake, Grand Rapids, Mich., and is being manufac- tured by the Dake American Steam Turbine Co. of that city. In Fig. 1 is shown a ring into the side of which the buckets are milled and which is bolted to a disk to form the rotor of the machine as shown in Fig. 2. Fig. 3 is a detail view of one of these buckets and shows a peculiar- ity of them, in that they are cut i FIG. 2--DAKE ROTOR ASSEMBLED. steps which permits the better utiliza- tion of the space afforded by the thick- ness of the disk. This also preserves a nearly uniform distance between the discharge end of the nozzle and the wall of the buckets. The complete rotor comprises a disk, upon which two of these bucket FIG. 3--DAKE BUCKET, SHOWING BOUNDING WALL AND BEVELED EDGE. rings are bolted, as shown in Fig. 2. The guide nozzle is placed between the bucket rings as shown in the draw- ing, Fig. 6. Fig. 4 is a diagramatic view of the buckets and nozzles. The construction is such that the steam is guided directly upon the working sur- faces, reducing the loss due to the formation of eddy currents. Experi- ments made by the inventor show a considerable increase of torque, which can be produced with a given nozzle and rate of flow by the use of this form of bucket. The nozzle block is shown in Fig. 5 and in section at A, Fig. 6; and also at A in Pig. 7; the latter being a section of a multiple stage turbine. The buckets are cut down on a bevel at their outer edges as plainly shown in Figs. 1 and 3, and the nozzles are extended upon a cor- responding bevel as shown in Fig. 5. This confines the steam against the curved wall of the bucket. The noz- zles are produced by inserting wedges C C, Fig. 4, into passages: of recti- linear cross section, the wedges being varied to produce any form of nozzle desired, and adapted to any degree of expansion with a standard form of construction. Referring to Figs. 6 and 7, the ac- tion of the steam can be clearly un- derstood. It passes- from a steam chamber, in the nozzle bucket through the nozzle, and is discharged upon the outer edge of the movable bucket D. This bucket deflects it, causing it to give up a portion of its velocity and energy to the moving disk, and then discharges it into .the passage of the stationary guide-block A underneath the nozzle block. This guide-block causes it to impinge upon the mov- ing bucket E upon the opposite side of the rotor, it escaping from the out- side edge into the exhaust passage, whence it is carried to the atmosphere in the single wheel machine, or to the next stage as shown in Fig. 7, where more than one rotor is used. In tur- bines of this type even the single wheel machine is compound, as the steam acts twice upon different sets of buckets. | The governor is of the centrifugal fly-weight type and is direct connect- ed to the turbine shaft. In the single wheel machines the governor operates -a pilot valve, which opens and closes a port governing a piston valve. This valve in turn admits steam to the turbine or shuts it off, the admission always being at the maximum pres- sure. In the multiple stage turbine, governing is accomplished by a make- and-break connection of a shaft, driven by worm gearing, with a shaft con-