. American engineer and railroad journal . is brought to a balance by pouring shot into thecone shaped bucket on the left, thus counterbalancing theweight on the right hand side. The test briquette is thenplaced in the grips and by means of the handwheel under thelower grip the slack is taken up. A piston valve in the bucketis then lifted and the shot flows out of the bucket, causingthe weight to overbalance the bucket and load thus to be ap-plied to the specimen. When a sufficient weight of shot hasflowed out of the bucket, the unbalanced force of the weightis sufficient to break the briquett
. American engineer and railroad journal . is brought to a balance by pouring shot into thecone shaped bucket on the left, thus counterbalancing theweight on the right hand side. The test briquette is thenplaced in the grips and by means of the handwheel under thelower grip the slack is taken up. A piston valve in the bucketis then lifted and the shot flows out of the bucket, causingthe weight to overbalance the bucket and load thus to be ap-plied to the specimen. When a sufficient weight of shot hasflowed out of the bucket, the unbalanced force of the weightis sufficient to break the briquette, and then the lightenedbucket is jerked by the weight and the piston valve in itclosed, causing the flow of shot to cease. The weight of shotwhich has flowed out is a measure of the force required tobreak the briquette, and this shot is caught in a scoop on ascale which is graduated to read directly the stress on thebriquette. If at any time the briquette should be so yield-ing as to allow the beam to strike the lower buffer before the. NEW RIEHLE CEMEN1 FESTER. briquette is broken, the valve automatically closes and theflow of shot ceases. Then, if desired, the beam can be raisedby means of the worm and wheel and the test piston valve (patent Nov. 8, 1904) for controlling the flowof shot is believed to be the simplest and most effective auto-matic valve made. If it is desired to make a test of extremeaccuracy the beam may be kept horizontal during the test bymeans of the crank and worm wheel. This description and operation applies to both sizes ofcement testers. The weight of shot in the 1,000-lb. machineis as 1 to 100 lbs.; this means that 10 lbs. of shot on an ordi-nary scale would indicate a strain of 1,000 lbs. In the 2, the proportion is 1 lb. to 80 lbs., viz., 25 lbs. of shotwill Indicate 2,000 lbs. strain. These machines have been placed on the market after prov-ing themselves In exhaustive tests, which is characteristic ofthe methods of th
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroadengineering
