1818.] Philosophical Transactions, 1818. Part I. 



449 



Derby grit from another quarry 



Killaly white freestone, not stratified. . . . 



Portland 



Craigleith, white freestone 



Yorkshire paving, with the strata 



Ditto, against the strata 



White statuary marble, not veined 



Bramley Fall sandstone, near Leeds, with 



strata 



Ditto against strata 



Cornish granite 



Dundee sandstone, or breccia, two kinds. 



A two inch cube of Portland 



Crai<j Leith, with strata 



Devonshire red marble, variegated 



Compact limestone 



Peterhead granite, hard close-grained . . . 



Black compact limestone, Limerick 



Purbeck 



Black Brabant marble 



Very hard freestone 



White Italian veined marble 



Aberdeen granite, blue kind 



Cubes of different metals of ^th inch were crushed by the fol- 

 lowing weights : 



Cast iron 9773 



Cast copper 7318 



Fine yellow brass 10304 



Wrought copper 6440 



Cast tin 966 



•Cast lead 483 



Bars of different metals six inches long and a quarter of an inch 

 square were suspended by nippers and broken by the following 

 weights : 



Cast iron, horizontal 1 166 



Ditto, vertical 1218 



Cast steel previously tilted 8391 



Blistered steel reduced by the hammer 8322 



Shear steel ditto 7977 



Swedish iron ditto 4504 



English iron ditto 3492 



Hard gun metal, mean of two trials 2273 



Wrought copper reduced by hammer 2112 



Cast copper 1 192 



Fine yellow brass 1 123 



Cast tin 296 



Cast lead 114 



Vol. XII. N° VI. 2F 



