"Fig. 14.— Photograph of commercial Portland cement clinkers showing particles of free lime visi- 

 ble to the naked eye. (1) Stationary kiln clinker (brand L); (2) stationary kiln clin- 

 ker (brand 0); (3) rotary kiln clinker (brand 0): (4) rotary kiln clinker (brand K). 



Fig. 6 —Characteristic crystals obtained by 

 the microscopic test from nonsin- 

 tered lime in Portland cement. 



Fig. 7.— Characteristic plume-like formations 

 of crystals obtained from sintered 

 lime. 



