On IVoolf's Steam-Engine. 4(;i 



nion, that these engines are by far die most elinible where asiv 

 mg m the consuuiption of coal is an object. 



Foxes and Neath-Abbey Iron Company, 

 Neath-Alihev Iron Works, p^p Tn^^.^TT, T vt 



Glamorganshire, 12il. Month 20d., 1315. ^ JOSl.,rH T. PmcE, 



Copy. 



a^l^'u'^ "'Hlersigned, being the principal agents of Crenver 

 patheld, and Abraham Mines, in the countv'of Cornwall do 

 hereby certify, that a,, engine erected on that>art of the afore 

 sau mme called Wheal Abraham, on Mr. Woolfs pat nt pr r. 

 cple the large cyhnder of which being forty-five inches 1,1 r 

 ha been "•orkmg for the last fourteen months drawing wa er 

 f. om a depth of 1 90 fathoms, with a load for the first ten lontS 

 ot upwards of sixteen pounds per scjnare inch, and for t^ h t 

 four months about fifteen pounds pe/- square inch ; tha 1 1 e S 

 engme has executed her work >• ^^o^J our most san'uiTe 

 expectations ; and we can with pleasure state, that the eng ne 

 durmg the hrst ten months exceeded the ^average effS of 

 Boul on and Watt's engines in this county as thhtv-fou to 

 weuty , and dunng the last four months considerably alove two 

 to one or as forty-seven to twenty. We also consider an ngi^^ 

 on Mr. Uoolfs prmc.ple less liable to hinderment thau an 

 engme on any other principle we have yet seen. 



^. 13. The load is lifted by the steam acting on botli pistons 

 bu IS equal to what ,s above stated, calculated on the supe S 

 ot the large piston. -i^^iutie!* 



Andrew Vivian, Thomas Lean, 



Robert Bennett, Wm. Davy._I occasionally attend at 



Phiup Richards, Wheal Abraham, and believe till 



November 1815. ^'''''■' ^^^^^'"^"t to be true. 



Copij. 



\v »u J . , , ^^''eal Vor, in Breni-c, Dec. 4, 1SJ-; 



^2M ^^^f,"'^' ''"'"S- the agents, do certify that the 

 duty done by Woulf's engine in this mine exceeds that of t e 

 other engine which is on Boulton and Watt's plan of erection oii 

 an average, as 116 to 34 ; that is to say, that Woolf . e.igh e pe' 

 forms the same duty by consuming thirty-four bushels of c.,al 



Smp^oroTAr '^"';" ^-^ ^'"^'^ ''-- '^- - ^- --- 



Witness our hands, 

 John Gundry, John Pkurv, 



\V.u.iAM Thomas, John Chynoweth, 



bAMUEL Adams, Thomas Powmng. 



LXXXV. On 



