292 An Account of some Experiments 



This was a very good experiment, as we knew from previous 

 trials very nearly the weight it would bear, and therefore added 

 the weights with more care towards the last. 



The specific gravity of the specimen was found to be 2' 113, 

 and it absorbs -^ of its weight of water. 



3. Our next trial was made with a piece of white siliceous 

 sandstone from Lord Keith's quarries at Long-annet, near Kin- 

 cardine Tullvallan, on the north side of the Forth. The specific 

 gravity of this stone is 2-212, and it absorbs -^-^ of its weight 

 of water. The texture regular, with small scales of mica dis- 

 tributed through it. The distance between the supports was 

 Ife inches, the breadth 1'45 inch., and the depth 1-.V25 inch. 



Weight 



.20 lbs. 

 30 — 

 40 — 

 50 — 

 60 — 

 70 - 

 SO — 

 90 — 

 92 — 



Dei 



•015 inch. 



•02 



•022 



•025 



•03 



•038 



•045 



•05 



broke. 



This stone is of a more flexible nature than either of the pre- 

 ceding J though from its appearance I expected a different re- 

 sult. 



A. The following- table contains the results of some experi- 

 ments in which the flexure was not ascert^tined; they were made 

 for obtaining- data for calculating the lateral strength of stone. 



These specimens, with the exception of one of the Long- 

 annet ones, were laid with their natural beds horizontally. 



Talle of ExperimentK on the lateral Strength of Stones. 



The 



