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0*2 0-4 0*6 0-8 1-0 1*2 1*4 1'6 1'8 2*0 22 2*4 26 2*8 3'0 



Deflections in 0*004 inch. 



Fig. 16 — Transverse Tests of Mortar Beams. 

 No. 1 — One Hemmoor Cement to three Emu Plains sand ; age 94 days 



>> " >» >> >> >> » a 154 ,, 



„ 3— „ „ „ „ „ „ 180 „ 



„ 4- „ „ „ „ „ „ 188 „ 



A second series consisted of five mortar beams of similar 

 composition to that just described and tested in a similar 

 manner; the span was 48 inches and each beam was rein- 

 forced with four rods f inch in diameter arranged on the 

 tension side, giving an area of 0*4416 square inches. The 

 width remained constant throughout the series, namely 

 9 inches, but the depth varied from 12 inches to 2 inches. 

 The results are recorded in Table VII. and fig. 17. 



These beams gave a modulus of rupture which decreased 

 as the depth was diminished, being 1,055 pounds per square 

 inch for the 12 inches depth, and 3,500 pounds per square 

 inch for the 2 inches depth, whereas the modulus of elas- 

 ticity increased as the depth was diminished, being about 

 three and a half times as great in the 4 inches depth as in 

 that of the 12 inch depth. The modulus of elasticity 



