Mining review . n slate stated to be best purple Bangorslate. The particulars are as follows:— P. N. Russell, Engineering Laboratory, University of Sydney- Test—Slate—CrosshrcalHng and Hardness. Modulus Resistance Xature Span. Width. Thickness Load in lbs. Central W ofRupture topunching Brinell Relative of pounds under drop hardness. hardness. Specimen. 1 b d per gq. hammer inch. inch-lbs. Inch Inch. Inch. Adelaide Slate .. 1-2 9 0-18 160 9S76 80 122 11 12 9 0-16 135 10517 80 119 0 97 (( (t 12 9 0 21 10430 60 101 082 <i <( 12 9 0-21 232 10521 6(J 92 0-75 Best PurpleBangor SUte 12 9
Mining review . n slate stated to be best purple Bangorslate. The particulars are as follows:— P. N. Russell, Engineering Laboratory, University of Sydney- Test—Slate—CrosshrcalHng and Hardness. Modulus Resistance Xature Span. Width. Thickness Load in lbs. Central W ofRupture topunching Brinell Relative of pounds under drop hardness. hardness. Specimen. 1 b d per gq. hammer inch. inch-lbs. Inch Inch. Inch. Adelaide Slate .. 1-2 9 0-18 160 9S76 80 122 11 12 9 0-16 135 10517 80 119 0 97 (( (t 12 9 0 21 10430 60 101 082 <i <( 12 9 0-21 232 10521 6(J 92 0-75 Best PurpleBangor SUte 12 9 0-15 130 11556 69 114 0-93 12 9 016 135 10516 63 88 0-72 It is remarked that the tests of the Bangor slates (which are understoodto be imported slates) Avere for comparative purposes only. The load on the Brinell machine was 500 kilogrammes for one formula for the modulus of rupture is :^ 3wl 2bd- Thc amount of carbonate of lime present in the slate, as shown by the fore-going analysis, is Australian Slate Quarry, Willunga.
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectminesandmineralresou
