COMPRESSIVE AND TRANSVERSE STRENGTHS OF BRICKWORK. LXVII. 



and the deflections under the various loads applied were measured 

 by means of verniers reading to '001 inch, and also with the 

 same dial extensometers which were used in testing the compress- 

 ions of the brick piers. Eight beams were tested, each 3 feet 

 long by one and a half bricks (approximately 13 J inches) wide, 

 -and three and six bricks deep respectively (Figs. 5 and 6). Four 



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Figs. 5 and 6. 

 of the beams were built in lime mortar, two of one to two and 

 two of one to four, and four in cement mortar of the same pro- 

 portions respectively. Two smaller beams were also built in 

 •cement mortar 14 inches long by one and a half bricks wide and 

 three bricks deep. The beams were faced with mortar to true 

 planes where they rested on the end supports, and on the central 

 knife edge through which the loads were applied. The general 

 results are recorded in Table X., and the deflections in Table XL, 

 and the corresponding curves are plotted in Fig. 7. 



4. Tests of the materials used in building the piers and beams. 



The tests made on the materials used in building the columns and 

 beams consisted of transverse and compressive tests of the bricks 

 .and of the various mortars, and also tensile tests of the mortars. 

 The compressive tests of the mortar were made on prisms or slabs, 

 •each 6 inches by 6 inches in area, but varying in height or thickness 



