. The railroad and engineering journal . RNAL. 4t water pressing against the back of the blades. Negative slipwill not be observed with this screw. In reversing the direction of movement, the working orderof the blades is simply reversed, so that when backing the vesselthe same advantages are obtained, and the useful effect of thispropeller will therefore be considerably greater in either direc-tion than that of any other known propeller. In the accompanying cut fig. i is a front view and fig. 2 a sideviewof the propeller. Among the advantages claimed for this screw by the inventorare, that it
. The railroad and engineering journal . RNAL. 4t water pressing against the back of the blades. Negative slipwill not be observed with this screw. In reversing the direction of movement, the working orderof the blades is simply reversed, so that when backing the vesselthe same advantages are obtained, and the useful effect of thispropeller will therefore be considerably greater in either direc-tion than that of any other known propeller. In the accompanying cut fig. i is a front view and fig. 2 a sideviewof the propeller. Among the advantages claimed for this screw by the inventorare, that it is the only one^strictly in^accordance^with theory ; We are informed that one of these screws has been appliedto the new German fast cruiser Creiff, with the result of in-creasing the speed from knots to knots per hour, thelatter speed being the average of two days continuous running. ^ Combination Turret Lathe. The accompanying illustrations show a combination turretlathe made by theBridgepori Machine Tool Works, at Bridge-. COMBINATION TURRET LATHE. that it is the only one drawing the full supply of water for itsblade area from in front, and ejecting a cylindrical column ofwater equal to its diameter directly astern ; that from its ar-rangement no blade will come in contact with disturbed water ;that it causes no back action within its disk and does not carryany water around with it ; that it will not lose in efficiencywhen the speed is increased ; that it will not cause shocks orvibrations to the ship ; that its backing power is much greaterthan that of any other screw. These claims seem to be sub-stantiated by reports of the performance of the screw in actualservice. port, Conn., which is intended for making screws or studs ofall kinds up to 2 in. diameter, and also for general work. It isa tool remarkable for the variety of work which it is able toperform and for its careful design and construction. The head has a three-section cone for a 4in. belt, the largest
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectrailroa, bookyear1887
