872 NEW YOEK STATE MUSEUiM 



Clay 



Silica , ,,. . „ 53.5 



Lime , . „ 6.15 



Te and Al oxids 24.2 



MgO 2.15 



Loss on ignition 14.1 



The clay is dried over steam pipes, broken to about i-i inches 

 size in a Potts disintegrator; and sent through a Bullock burstone 

 mill, which grinds to about 16 mesh. It is then weighed, and 

 mixed with the wet marl as both are shoveled into the chutes lead- 

 ing to the revolving mixer. The mixture then goes to the pug 

 mills, and is made into bricks, which are sent to the drying tunnels. 

 The lower tier of these tunnels is heated by direct heat, on the 

 Cummer system; the upper tier by exhaust steam. 16 dome kilns 

 are in use. From the kilns the clinker goes to an 18 x 30 inch 

 Blake crusher; then to dry pans, receiving its final reduction in 

 Sturtevant rock emery mills. The product is marketed as the 

 Genesee (Wayland) brand. 



Allied products 



Sand cements. Two companies, under practically the same 

 management, are at present engaged in the manufacture of sand 

 cement. These are the Standard silica cement co., whose works 

 at Long Island City were described in detail in Engineering news 

 of April 16, 1896, and the Glens Palls Portland cement co. At the 

 plant of this latter company, their Iron Clad cement is used, the 

 resulting sand cement being marketed as the Victor and Adiron- 

 dack brands, the latter carrying a larger proportion of sand. At 

 the Long Island City plant the sand was first dried in Cummer 

 dryers; then screened, mixed with the cement in the proper pro- 

 portions, and ground in Davids en tube mills. 



" Natural Portlands." Two firms in ]^[ew York state manufac- 

 ture, in addition to their natural cements, brands which are mar- 

 keted as " natural Portlands.'' The limestone is fed, without 



