Millstone Page: 4 of 4
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relatively very large proportion of the total
. faces of the stones. I have found by prac-
tical demonstration that, by this construc-
tion of the millstone dress, a much more uni-
5 form product is secured than where larger
proportions of the faces of the stones are
grooved or furrowed; the material may be
ground without objectionable heating of the
product; and the speed of the operation is
10 largely increased.
Having thus fully described the invention,
what I claim as new is:
1. A millstone having a grinding face com-
prising a general surface lying. in a single
1.5 plane, and a dress consisting essentially of
an annular depression or feed groove in its
central region having exits in the form of
leading or feeding furrows extending tan-
gentially from said groove in a direction in-
20 dining backward from the direction of rota-
tion, and of a length not greater than the
diameter of the annular groove; said furrows
having inclined bottoms shallowing. out-wardly and rearwardly into the general plane
or face of the stone, substantially as specified. 25
2. The combination of a pair of millstones
each having a grinding surface lying in one
general plane, a central annular depression
or feeding groove, and feeding furrows lead-
ing therefrom and tangential thereto, having 30
a length no greater than the diameter of said
annular groove and dying rearwardly into
the general plane of the surface whereby the
grain as it is fed outwardly receives a shear-
ing or preliminary grinding action from the 35
two sets of grooves, and a maximum pro-
portion is. secured of coating grinding sur-
faces each lying in one general plane, sub-
stantially as specified.
In testimony whereof, I affix my signature 40
in presence of two witnesses.
JOHN L. DURHAM.
Witnesses:
JAMES CLEPPER,
LEWIS PAYNE.9
891,050
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Durham, John L. Millstone, patent, June 16, 1908; [Washington D.C.]. (https://texashistory.unt.edu/ark:/67531/metapth511800/m1/4/?q=%22%22~1: accessed June 21, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu.; crediting UNT Libraries Government Documents Department.