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50. as the apron moves along. This ar- rangement provides an absolutely ac- curate method of automatically count- ing each item conveyed into or out of the boat. The driving of the conveying apron is accomplished by means of chain and sprockets, the chain fastened to the un- derside of the apron and within the frame and the sprockets on shafts at each end. The driving motor is placed centrally within the conveyor and is connected up with driving - sprockets. The conveyors built in sections ,may be made to serve any area or length of dock by laying the extension sections . end to end* with the main conveyor. Small sprockets on the outside of the end shafts of each transmit power from the motor of the main conveyor through as many sections as desired. Chain adjustments are provided both for the end axles and the motor. The carrying apron runs on_ steel, roller bearing rollers, placed two inches apart on both sides of the conveyor so that its movement requires a minimum of power. The whole. conveyor is mounted on roller bearing truck wheels so that it is readily movable as desired. The main conveyor can be set at any angle as can also the extension convey? ors and side boards are provided where required. = This "device, which is guaranteed should operate to great advantage both in the saving of time and expense as well as in the reduction of labor re- quired. Two of thesé conveyors are . now being installed on the docks of the Western Transit Co. at Buffalo. - RECEIVER FOR SYSTEMS OF SUBMARINE SIGNALING. -In the accompanying drawings are shown three views to illustrate certain SS zB oS GUM CGP? "Vf arenes 7 Uj ed ---- -------------------- \ |--N -------------- Se 7 rhachis Vl Wi LEZ) D : hi 2 : Lda new and useful improvements in receiv- -ers for systems of submarine signaling, .at a high presstre. 'THE MARINE. REVIEW the invention of Lucien I. Blake, of Boston, Mass. Fig. 1 is a view in elevation of the sound producer. Fig. 2 is a longitud- _inal cross-section of the operative parts of the same. Fig. 3 is a sectional view of the sound receiver in which the in- vention, upon which the present appli- cation is based, is embodied. Referring to Figs. 1 and 2, A is a cylinder of steel shown as closed at one end and with the other open end bev- eled at an angle of about 60 degrees to sharp edges. It is not necessary that il IN oo v aes i i i l/ ~ Yd | | | | i | | fl ft the cylinder be closed, but, to secure the same free period of vibration of a column of liquid within it, an open cyl- inder must be of double the length. In practice the inventor has found that for good results a cylinder designed for a given pitch and having a bore of three inches in diameter and 11 inches long 'should have walls 1%4 inches in thick- ness of very hard tough steel built up by shrinking several tubes, one over the other. : B, B, are side bars connecting with heads C, D, of a rigid frame. In the head C is secured a chamber E, pro- vided with an inlet through which water is introduced by a pipe G from any suitable source capable of delivering it Within the cham- ber E is a spider H carrying a plate K of slightly smaller diameter than an opening in the end of the chamber, and which' therefore leaves an annular ori- fice L preferably of about 1-32 of an inch in width. In the head D is a cir- ~ cular opening with threaded walls with which corresponding threads on theex- terior of the cylinder Aengage. By this means the cylinder is rigidly supported with its. beveled edge in proper posi- tion relative to the annular orifice L and with the capability of adjustment with respect thereto. The cylinder A is . adjusted to bring its edge in close proximity to the annular orifice L, and is submerged at any desired point where the sounds or signals are to be produced. Water under pressure, preferably from 125 to 200 pounds, is supplied to the chamber E, and issuing therefrom in the form of an annular jet impinges upon the edges and beveled end of the cylinder A, with the result that the har- monic or regular periodic vibrations are set up in the column of water within the cylinder. These vibrations, owing to the unyielding character of the boundaries of the chamber or cavity in which the column of water is contained are reflected back and forth from the walls and the column is therefore set in sonorous resonance. Such an appar- atus will produce atone of definite pitch dependent upon the dimensions of the chamber or cavity within the cylin- der A. The inventor has found that sdunds thus produced will be carried to great distances through water, and may be detected. and rendered audible by suitable sound. receiving instruments the more readily. because of their dis- -- tinctive musical character. By interrupt- ing or varying the pressure of the water supplied to the chamber. E, or by' de- flecting the jet issuing from the orihce in said chamber, distinctive signals, ac- cording to any prearranged code, may be sent by this device. Ree In Fig. 3 S represents' a portion of the skin of a steel vessel. To the inner surface of the skin is secured, by means of bolts passing through the flanges at - its end, a steel cylinder M of the same character as that described in, connec- tion with Figs. 1 and 2. The opposite or inner end of the cylinder is closed by a head N of corresponding thick- -- ness, the edges of which are threaded to engage with threads in the inner surface of the cylinder. A small orifice B is formed in the head and an ordin- ary microphonic transmitter T is se- cured over the same or placed at any point at which it will be operated by the resonance of the column of water contained in the cylinder. Wires O, O, connect the microphone with an ordin- ary. telephone receiver. A small open- ing R may be drilled through the skin of the ship in order to permit access of the water into the cylinder but is not necessary as sounds coming through