i)r Traiil on the Mineralogy of II alhm Mountain^ 
French biihrs used in his milL Another pair have been at 
work four years in a fiour-mili within a few miles of Holywell, 
and are reckoned equal to the foreign millstones. At Dunham^ 
6’'-the-HUl^ between Chester and Frodsham, a curious experi- 
ment has decided the value of this rock. A pair of millstones 
were constructed, with alternate pieces of the French and Hal- 
kin buhr. These have been in use about four years, and con- 
tinue to give as perfect satisfaction as if the whole had been 
constructed of foreign stone 
* The following documents are copies of letters which the proprietors have re- 
ceived from several intelligent millers of experience ; 
“ Gentlemen, 
“ I have given the Flint buhr mill-stones a very fair trial, and you may send 
buhrs for another pair as soon as convenient. 1 have great pleasure in saying they 
answer remarkably well, in some instances better than the French mill-stones, par- 
ticularly in respect to cone wheat ; and in other kinds of wheat, they are not infe- 
rior to the French. I have now at work twenty-two pair of mill-stones, some 
from Whittle Hills, some from Mow Cop, some from Beestone, some from Angle- 
sea, several from France, and one pair from your quarry, and your Flint Buhrs 
are, in my opinion, superior to any of them, in respect to the flour of wheat. I 
have tried a Flint buhr-bedstone, with an Anglesea runner, and the grinding was 
much inferior than at present, as both of the stones are of the Flint Buhrs. 
“ If you or your friends wish any further information on the subject, I will 
most willingly reply to any inquires, or the stones may be seen here at work at any 
time. I am, &c. John Dumbell. 
, Mersey Mills^ Warrington^ OcU 1820. 
“ To the Welch Company.” 
Gentlemen, 
Inclosed I hand you a draught for a Flint buhr-millstone 1 received several 
months back on trial. I suppose you thought me long in making up my mind | 
but to give a just report requires a deal of tune, and indeed is a serious matter, as 
millstones well made will last for many years. However, 1 have to say it has beeri 
applied several weeks in grinding wheat ; it grinds equal to French stones, and 
better than some of them ; but I had it to grind barley, peas, beans, &c. and, as 
such, it is now working. I can say it answers better than ever I met with one be- 
fore, from an experience of more than thirty years. The face and dress keep good, 
and for a great length of time. I intend in the spring to have a pair 4 feet 8 inches 
to grind wheat. I am, &c. Jno. Pratt. 
“ Saredon Mill, near Walsal, Staffordskire* 
“ To the Welch Company.” 
“ Gentlemen, 
‘‘ It is with the greatest pleasure I give you leave to say, that I wished to try a 
buhr of your Flint quarry, and as you were so good as to give me one, I caused it 
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