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Whiteleeshield March 9th. 1773. Sir I have been either so unwell of a Pain in my Head, or so very busy, since I waited on you at Newcastle Octor. the 14th. 1772, that I have never been able to get properly forward with the calculations relating Fallowfield – lead-mine, and, but for the above reasons, should be ashamed to offer my thoughts now, so late. However, I have at last taken all the pains I can, and find, from what I have observed, and have been informed of, from time to time That Westward From the Engine Shaft, - which is 63 1/2 fathoms deep. To – where Acomb level cuts the Vein fathms Bank level at a Shaft Called Nook Shaft, it is 259 12 Nook Shaft 27 fa: deep. To where Mr.Walton propos’d an Engine, mark’d D, in his plan 547 27 1/2 Which is not so deep as Acomb-level by 11 1/2 fathoms To North-Tyne -level mouth 973 51 1/2 To Ditto level forehead 736 And from Acomb level-head, at Nook Shaft To Tyne level forehead 477 Now fathms The Bank-level from the Engine to Tyne, being 51 1/2 The Bank-level from the Engine to Nook Shaft 12 And the deepth of Nook Shaft 27 Makes the level, from the Engine Shaft top, to Acomb-level head at Nook Shaft foot 39 Which, deducted from the depth of Tyne-level 51 1/2 fa: shews Tyne-level to be, deeper than Acomb-level, only 12 1/2 Of which probably has, and will be lost, in driving up the sd. Tyne level to Nook Shaft 2 1/2 So that, the difference at most will be only about 10 faths. gain’d, by driving, or bringing up Tyne-level 477 faths. at 3 or 4 £ a fathm. provided you keep clear of all misfortunes. From the above measurements &c. the ground west of the Engine, may, in my opinion be sufficiently tryed, with an Engine fix’d at Nook Shaft, called, The new statical Engine, being such a one as we mostly use in this Country now, as they are, not only the cheapest, but answers the purpose best where the fall is great, as at Nook-Shaft; or indeed any fall [above] 5 faths. and is the only one I know of that would ansr. the purpose there; which I think it would do, with the Water afforded by St. Oswalds Colliery and the other feeders you might collect to work it with. It is a trial, like the others, that I would not be fond of Encouraging you in, tho’ it is certainly the most promising of any about Fallowfield-mine, that I know of, done at the least expence <an>d undoubtedly in the least time. The Engine may be mostly made from the Materials of the old one, if you choose to take it out; And Acomb-level and Nook-Shaft might soon be opened out; which Shaft with a little alteration would Ansr. for the Engine Shaft, as well as a drawing and climbing Shaft. Your present feeders at Fallowfield is about 65 Ale-gallons pr minute in Summer, and 104 in Winter; which feeders, tho’ not great, are considerably greater than I expect you would have at Nook Shaft; feeders I expect (I mean Nook-Shaft feeders) the New Engine would draw from the deepth of 25 or 30 faths. below Acomb-level, where she would land her water; but the deepth would be more, or less, in proportion to the quantity of water you would meet with. I am Sir Your most obedient huml. Servt. to command Wm. Westgarth
William Westgarth invented the hydraulic engine he recommends to J.E.Blackett for dewatering Fallowfield. He was a mine agent for Walter Calverley Blackett. An ale gallon was 282 cubic inches, very slightly larger than the later imperial gallon.