. American engineer and railroad journal . Fig. 1.—Single Metallic Hose. veyance of steam, compressed air, water, oils, acids, alkalies,benzine, gasoline, naphtha or gas. Heretofore metal hose hasbeen known as flexible metallic tubing. This tubing is quitedifferent from metal hose, in that the former consists of asingle tube, which can only be satisfactorily used where it isnot hauled, twisted or subjected to hard usage. It has, there-fore, not come into extended use. This tubing has been made inEngland and France. The invention known as double metal hose is not an indiarubber tube enclosed in
. American engineer and railroad journal . Fig. 1.—Single Metallic Hose. veyance of steam, compressed air, water, oils, acids, alkalies,benzine, gasoline, naphtha or gas. Heretofore metal hose hasbeen known as flexible metallic tubing. This tubing is quitedifferent from metal hose, in that the former consists of asingle tube, which can only be satisfactorily used where it isnot hauled, twisted or subjected to hard usage. It has, there-fore, not come into extended use. This tubing has been made inEngland and France. The invention known as double metal hose is not an indiarubber tube enclosed in metal. It is constructed of metallictape, which is rolled up in the form of a spiral so that theedges overlap and fit tightly into each other, without detract-. Fig. Metallic Hose. ping edges of the tape. This hose is only for light work wherethere is not much pressure. In another system, shown in oneof these engravings, the packing is of asbestos. It does notlie between tne overlapping edges as in the first system, butis held firmly in a groove of the tape. A third method is thedouble hose, which is shown in the second illustration. It ismade of two tubes, one within the other, and firmly fastenedat the ends. The coils of the tubes are turned in oppositedirections. The double coil prevents this form of hose frombecoming untwisted, by careless handling or great strain, asmay happen to the single coil hose. The double tube hose canbe made, for special service, capable of withstanding a pressureof 3,000 lbs. per square inch. Its uses are varied. It can beused for conveying steam at any ordinary pressure. It is usedfor blowing flues, for rock drills, and is serviceable on rail-roads, in roundhouses, shops, mines, tunnels, etc. For con-
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroadengineering
