Many times visitors to the Snyder Estate ask what is the difference between Natural and Portland cement.  The Spring/Summer 2001 issue of  Natural News had excerpts from a Consolidated Rosendale Cement Co. (C.R.C.Co.) booklet printed in 1910 which explained how Natural cement was made.  With this issue we will show how Portland cement  was manufactured  during  the same time by the Chicago Portland Cement Co.  (C.P.C. Co.) The manufacturing process described by the C.R.C.Co. for Natural cement and the C.P.C.Co. for Portland cement were typical for each cement type.

In 1910 the American Natural cement industry was celebrating  92 years of manufacturing and the American  Portland cement  industry was only 39 years old.  Ten years earlier, in 1900, Portland cement had matched the annual output of Natural cement.  From 1900 on, Portland cement production increased each year  and natural cement production decreased.

(To be continued)