ILLUSTRATIONS. 



Plate VI. 



Photograph, of a cement which failed to pass the steam test because of the 

 inertness of its finest particles. 



TEXT FIGURES. 



Fig. 16. Seteeurves obtained from cement Oi wliich show the characteristic effects 

 or gauging a non-seasoned, non-plastered Portland cement with dif- 

 ferent quantities of water. 



17. Set curves obtained from cements Oi, K and L which show the unlike 



influences of small amounts of plaster on the setting properties of 

 different non-seasoned Portland cements. 



18. Diagram which shows quantitatively the unlike influence of small 



amounts of plaster on the plasticity and time of initial set of different 

 non-seasoned Portland cements. 



19. Set curves obtained from cement K which show that the- effects produced 



by the addition of small amounts of plaster are influenced by the 

 extent to which the clinker has seasoned. 



20. Diagram showing the effects of fineness upon the setting properties of 



Portland cement which has been subjected to thorough and prolonged 

 aeration. 



21. Diagram which shows the extent to which the effects of thorough aera- 



tion on the setting properties of Oi cement were influenced by the 

 quantity of plaster used. 



22. Diagram which shows quantitatively the unlike effects produced by 



adding small amounts of plaster to cement K before and after the 

 clinker had seasoned. 



251 



