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Messrs Peter and James Mulcaster. Farnacres 3d August 1781
On looking over the last Operation for the Ore of 1780 we find that you gave set down 1000 pieces of Refineable Lead less than had been refined and had reckoned the Refined Lead produced in that Operation to be 1Cwt pieces instead of 1 1/2 Cwts which errors we gave rectified and desire you will set the Originals in your hands right.
By James Johnson we send your Books of Operations and two of your Books Copied from them by which you will see there are some errors which you will we doubt not rectify.
It will be necessary in the forming of a calculation of the Value of Slags to know which weight of Black Slags is produced from a given Quantity of Grey Slags.
We have every great satisfaction in acquainting you that, tho' our produce in the Reducing way has not been so good last year as usual, the Profits by Langley Mill for last Years Ore vastly exceed any thing before made by the undertaking & that we have the best Opinion of your attention to the different articles committed to your care.
We are. Your Humble Servants
Walton & Turner
