. Annual report of the Massachusetts Highway Commission . u^n 5IDE Elevation FRONT ElEVATIOM SECTlOriAL PLAN A-/ No. 54.] APPENDIX D. 61 of the commission, to determine some way of testing this importantproperty. The test finally adopted is an impact test, to which stonedust briquettes are subjected. To make a briquette, dust that is to be tested is passed through ascreen with forty meshes per cm. (100 per inch), and is obtainedeither from the detritus of the abrasion test or by specially reducingthe stone. The reduction can be accomplished by placing somefragments of the stone in one of the c
. Annual report of the Massachusetts Highway Commission . u^n 5IDE Elevation FRONT ElEVATIOM SECTlOriAL PLAN A-/ No. 54.] APPENDIX D. 61 of the commission, to determine some way of testing this importantproperty. The test finally adopted is an impact test, to which stonedust briquettes are subjected. To make a briquette, dust that is to be tested is passed through ascreen with forty meshes per cm. (100 per inch), and is obtainedeither from the detritus of the abrasion test or by specially reducingthe stone. The reduction can be accomplished by placing somefragments of the stone in one of the cylinders of the abrasionmachine, together with a flat-end steel hammer of about ten poundsweight, and allowing the machine to run until a sufficient quantityof the stone is pulverized. The dust is made into briquettesof circular section of 25 mm. (.98 of an inch) in diameter and 25mm. in height, by placing the dust in a metal die of the properdimensions, mixing with it enough distilled water to moisten the dust(4 c- c. or .24 of a cubic inch), inserting
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