LXVIII. 



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

 BRICK BEAMS. 



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Load in tons. 



Fig. 7. 



from 12 inches to J inch. The results are recorded in detail in 

 Table XIII. Cross breaking tests of the mortar were made on 

 prisms 2 inches by 2 inches in section, supported at each end and 

 loaded in the centre of a span of 10 inches; the results are recorded 

 in Table XII. Shearing adhesion tests of the mortar were 

 made in which one brick was made to slide relatively to another,, 

 to which it was connected by a mortar joint in single shear, or 

 between two others in double shear as shown in Figs. 10 and 11 

 (Table XV.). 



Tests were also made to determine the direct adhesion of discs 

 of brick inserted in the centre of moulds for making mortar 

 briquettes, the adhesion being measured by the tensile stress 

 necessary to separate the mortar from the disc of brick (Table 

 XVI.). Table XVII. gives the results obtained some years 

 ago in regard to the shearing resistance of a particular brand of: 

 pressed brick united (as shown in Figs. 10 and 11) with cement 

 mortar of various kinds, and is reproduced here for purposes of* 

 comparison. 



5. Conclusion in regard to the compressive tests of brick piers. — 

 The experiments on the strength of brick piers subjected to a 

 compressive load were made in order to ascertain both the crush- 

 ing strength, and the deformations under equal increments of 



