400 cox. 



Table VI. — The rate at which tuff dries in. the air. 



Time of aeration. 



Period 



of 

 aera- 

 tion. 



Water referred to the dry stone in 

 cubes of approximately — 



Average 

 temper- 

 ature 

 during 

 period. 



Average 

 humid- 

 ity 

 during 

 period. 



Rainfall 

 during 

 period. 



2.5 cubic 

 centi- 

 meters. 



5 cubic 

 centi- 

 meters. 



10 cubic 

 centi- 

 meters. 



20 cubic 

 centi- 

 meters. 



When saturated-. 

 2' hours 



Hours. 

 

 24 

 4 

 16 

 4 

 4 

 16 

 8 



181 



211 



13 



13 



f 24J 



1 24 



47 



50 



22i 



48 



611 



52 



45 



30 



46 



119 



59 



231 



70 



312 



Per cent. 



35.31 



32.05 



24.35 



3.89 



2.79 



2.39 



1.99 



1.64 



Per cent. 



35.07 



33.60 



30.40 



19.33 



17.73 



15.25 



9.23 



5.72 



2.91 



1.92 



1.73 



1.72 



Per cent. 

 3.5.52 

 34.79 

 32.66 

 28. .55 



Per cent. 

 35.35 



°C. 



Per cent. 



mm. 



31.6 

 32.5 

 24.6 

 28.1 

 27.2 

 24.6 

 29.2 

 24.1 

 26.5 

 27.7 

 25.1 

 ( 27.1 

 I 26.0 

 26.1 

 27.1 

 27.3 

 27.1 

 27.9 

 28.3 

 27.5 

 28.0 

 27.6 

 28.3 

 27.7 

 28.5 

 27.5 

 28. 1 



50.5 

 49.7 

 78.2 

 64.6 

 75.0 

 88.4 

 6.5.6 

 75.2 

 66.6 

 70.0 

 81.1 

 75.7 

 87.7 

 74.3 

 65.3 

 68.8 

 69.4 

 65.2 

 63.6 

 66.6 

 65.6 

 66.3 

 68.3 

 61.4 

 66.4 

 77.6 

 78.0 



















6.1 



0.5 























0.1 

 58.0 

















































 38.2 

 84.2 







22' hours 





26- hours 





3O3 hours 



26.73 

 23.40 



30.97 

 28.75 



465 hours 





73 hours 



16.13 



10.58 



8.64 



7.17 



4.64 



3.30 

 2.54 

 2.34 

 2.16 

 1.95 

 1.92 

 1.95 



25.84 





1.64 



107j hours -_ 

 120J hours 



21.97 



1.64 







1 





12.30 

 9.22 



6.94 

 .5.70 

 4.59 

 4.04 

 3.56 

 3.20 

 2.59 

 2.30 

 1.82 

 1.80 

 1.75 



266 hours 



288i hours 



336i hours 



398 hours 









1.68 









450 hours 







495 hours 







545 hours _ 























769 hours 









1,000 hours 



1,070 hours 



1,382 hours 



After drying at 

 105°toll0°and 

 cooling in a des- 



















1.94 

 0.00 



0.00 



0.00 















