COMPRESSIVE AND TRANSVERSE STRENGTHS OF BRICKWORK. LXIX. 



loading. Thus the load applied was increased by equal increments 

 of two tons which on the section of 9 inches by 9 inches was 

 equivalent to about 3*6 tons per square foot, but in spite of the 

 care taken in building the column, the uniformity of the mortar 

 joints, the placing of the column in the machine and the accuracy 

 with which the compressions produced by the load were observed 

 the results obtained were very irregular, and it would appear to 

 be impossible to establish a modulus of elasticity, even for a given 

 brick and mortar. The authors are lead to doubt the possibility 

 of obtaining exact information on this point owing to the impos- 

 sibility of maintaining the conditions sufficiently uniform in 

 building the piers of brickwork or in the bricks themselves. The 

 curves (Figs. 8 and 9) show the loads applied and the compressions 

 produced by them in the long columns. The results for the short 

 columns were more uniform as they were nearly a year old and there 

 were fewer mortar joints, and these had attained a greater strength 

 than those in the longer piers which were generally only four 



BRICK COLUMNS IN CEMENT MORTAR. 



10 20 



Load in tons. 



Fig. 8. 



