BUILDING AND ORNAMENTAL STONES OF N.S.W. 



191 



Table showing the Crushing Strength of some well known 

 Australian Building Stones — continued. 













Rate of 



6 

 2; 



Kind. 



Locality where 

 obtained. 



Size of specimen in 

 inches. 



Strength 



in tons 



per sq. in. 



load ap- 

 plied in 

 tons per 











minute. 



1 



Marble 



Caleula 



3-00 x 3-03x3-01 



9-44 



6-60 



2 







3-02 x 3-03x3-03 



7-09 



8-11 



3 







2-98x3 03x3-03 



6-09 



10-99 



1 



Marble 



Kempsey 



3-02 x 3-02x3-03 



6-69 



8-72 



2 







3-01 x 302x3-01 



6-66 



7-57 



3 







3-01 x 3-02x3-02 



7-99 



14-54 



1 



Marble 



Fern brook 



302x3 03x302 



7-28 



11-11 



3 







302x303x3-00 



8-31 



12-68 



1 



Marble 



Borenore 



3 01 x 3 01 x2-97 



5-46 



7-07 



2 







3-00 x 2-97x3-01 



5-16 



4-18 



3 





5) 



3-00x2-97x302 



5-92 



2-63 









Fernbrook 



3-01 x 303x300 



4-66 



2-68 



1 



)» 



Springhill 



303x301 x300 



7-47 



2-52 



The Effect of Heat on New South Wales Building 



Stones. 







Temp, of 



Time in 





flo, 



Rock Treated. 



Furnace 



°C. 



Furnace 

 Minutes. 



How Treated and Remarks. 



1 



Pyrmont 

 Sandstone 



750 



15 



Plunged suddenly into cold 

 water at 12° C. Practically 

 no effect. Edges unchipped, 

 colour considerably deepened, 

 otherwise uninjured. 



2 



»J 55 



746 



20 



Cooled slowly in air, colour 

 changed from straw yellow to 

 pale pink, otherwise uninjured. 



3 



J) 55 



800 



15 



Half submerged in cold water. 

 A crack at once appeared at 

 right angles to the surface of 

 water. 



4 



55 55 



760 



45 



Heated gradually during 45 

 minutes and half submerged 

 in cold water ; after short 

 interval cooled under tap; un- 

 injured. 



5 



Bundanoon 

 Sandstone 



751 



25 



Half submerged in cold water; 

 afterwards cooled beneath tap. 



