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460,509
proportions for making a uniforni quality of
cement, although the same is inade in a short
time from freshly-dug material.
By mixing the fresh materials in propor-
5 tions determined by weight we are enabled to
approximately get the proper proportions at
the start, so that any correction in propor-
tions can easily be made, if necessary, when
the tempered material is tested, and often-
io times the proportions as weighed ont will be
found to be correct.
We claim as our invention--
1. In the process of preparing and temper-
ing slurry for Portland cement, the process of
15 mixing and correcting the proportions, which
consists of taking soft, damp, or wet freshly-
dug and unprepared clay and soft, damp, or
wet freshly-dug and unprepared calcareous
material in substantially the proportions
20 herein set forth, mixing and working the
same when fresh, testing a portion thereof to
ascertain the proportions of the mlass, and
then, if necessary, correcting the proportions
by adding material, as described.
2. In the manufacture of Portland cement, 25
theprocessof preparing and tempering slurry,
which consists in mixing. in proportions de-
termined by weight, the freshly-dug clay aild
limy materials, working them when soft,
damp, or wet, testing a portion of the mixed 30
mass to determine proportions, and, if neces-
sary, adding material to attain desired pro-
portions, substantially as described.
GEORGE It. KAL'TEYER..
GEORGE W. BARTIIOLOIEW, Jr.
Witnesses to the signature of Kalteyer:
GEO. J. F. SCHMITT,
W. C. KALTEYER.
Witnesses to the signature of Bartholomnew:
J. A. McILVAIN,
SAIMUEL RANKIN.