LXXXIV. 



W. H. WARREN AND S. H. BARRACLOUGH. 



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The strength of the mortar used in 

 piers was not tested, but the lime 

 mixed with 2 vols, of standard sand 

 obtained from Leighton Buzzard 

 gave at — 



4 weeks 6-08 tons per square foot. 

 12 „ 8-73 

 24 „ 15-72 

 34 „ 28-19 



Specimens tested were prepared in 

 cubes 3 inch sides. The mortar used 

 in piers was about half as strong as 

 that with standard sand. 





Ratio of 

 strength 

 of pier to 



brick 

 percent. 



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-J 







London Stocks 

 from Sittingbourne 



Gault bricks from 

 Burnham, Kent 



Leicester Red from 

 Elliston, near 

 Leicester 



Blue Bricks from 

 Rowley Regis, 

 wire cut, no frogs 



