. India rubber world. c installa-tions for nearly all other purposes, while air for operatingriveters, drills, sand blasts, blow torches, etc., may be taken fromthe same pipe line. The pressure in the storage lank may vary from only a fewpounds per square inch up to 200 or more, and the streng^th of the rubber hose must, ofcourse, vary hose for pneumatictool service must be light,strong and flexible towithstand intermittentpressures. It should re-main free from kinkswhen bent in sharpcurves and the lining orinner tube should be ofheavy quality to protectthe fabric. Hose of thisty
. India rubber world. c installa-tions for nearly all other purposes, while air for operatingriveters, drills, sand blasts, blow torches, etc., may be taken fromthe same pipe line. The pressure in the storage lank may vary from only a fewpounds per square inch up to 200 or more, and the streng^th of the rubber hose must, ofcourse, vary hose for pneumatictool service must be light,strong and flexible towithstand intermittentpressures. It should re-main free from kinkswhen bent in sharpcurves and the lining orinner tube should be ofheavy quality to protectthe fabric. Hose of thistype is built up of alter-nate layers of rubber andduck fabric, the lattervarying from three toeight-ply; four and five-ply hose are the kindsmost commonly employedin connection with ma-chine shop tools. Thedemand for this type ofhose has increased rap-idly in recent years, dueto the popularity of thepneumatic tool. For veryhigh pressures the hose isusually armored with acoil of strong wire toand prevent them from blow-. Fu,. 2. Urucklieb Bl.\st WithRubber Hose Att.\ched. support tlie walls of the tubining out. It is sometimes much easier to take the tool to the work thanto take the work to the tool, especially where moving the ob-ject which is to be worked upon involves heavy handling. Here,also, the rubber hose plays an important part. For instance, ifit is required to drill a number of holes in a heavy piece ofmachinery which cannot be placed upon a drill press, how muchmore advantageous and labor-saving it is to simply attach apneumatic drill to a hose and thus do the work in one-quarterof the time required by a hand drill. Many jobs which wereformerly impracticable are now made easy and inexpensivethrough the introduction of the rubber hose in connection withthe compressed air-driven drill. Hose for this purpose is of thesame type and construction as that for the pneumatic riveter,llie size and ply varying with tlie air pressure and size of thetool. For conveying both
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