LXX. 



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



BEICK COLUMNS IN LIME MORTAE. 





































































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Load in tons. 



40 

 Fig. 9. 



months old. On the whole, however, the inconsistencies in the 

 results are considerable and difficult to explain. 



The crushing strengths obtained were more satisfactory, and 

 may be taken as showing the load necessary to produce the first 

 indications of failure, which always appeared as a fine crack or 

 cracks, visible under a large magnifying glass. Sometimes these 

 cracks would appear on one side only, but more frequently on all 

 four sides at about the same time. The loads were applied slowly, 

 giving just time to observe and book the readings of the extenso- 

 meters, and in some cases the loads which might be expected to 

 produce fracture were maintained for times varying from five 

 minutes to fourteen days. When fracture occurred nearly all the 

 bricks were broken. Taking the average of the five tests made 

 on cement mortar piers, the load producing cracks is 172 tons per 



