MR. HORNBLOWfiR ON HORSE POWERS. 97 



3ti5 this is ftill in the commonly received opinion as to tlie weight 

 «^F the hogfliead, I would rather turn to thole who have made 

 their experiments on a weight of folid matter, exprefled in 

 terms which cannot Ibe miftakenk 



I remember to have had fome converfation on this fubje6l Mention of 

 many years ago, with the late Samuel More, at that time fe- ^^^^ reaaio.i 

 cretary to the Society for the Encouragement of Arts, Sic. againft horfes, 

 when he fliewed an inlirument conftruded on purpofe to de- M.re^E^q^ ^-^jj 

 termine the refinance againft horfes at plough. I do not re- an Liflrunri'-Pt. 

 collea that I made any minutes on the refult of our converfa- -^^"^"^ ^ y>"»ir 



, witb graduation^ 



lion, fo can only fay that his relation ot the fa6t furprifed me, 

 until I came to compare it with the efFe6t of horfes adtuaily 

 applied to overcome a load drawn up a (haft in a mine; but I 

 had not the fame means of determining the re-adiion that he 

 had; however, the refult of his experiment may be feen in the 

 Tranfadions of that Society; fome obfervations on it may be 

 feen in the 3d vol. quarto, of the Philofophical Journal, page 

 1 36, only there feems to be a miftake in the deduction in the 

 note: it fiiould be 26^1.; 10 :: 1375 : 52 4- 



I much wifli to have an experiment like Mr. More's made Propofed experi- 

 by a fledge drawn forwards and backwards on a level road, "*^"'* 

 with Mr. More's inftrumcnt placed between it and the horfes; 

 fuch an experiment would be very pra6ticable, and the fmall 

 deviation from the true level of a road would be compenfated 

 hy alternately going firfl: one way and then the other. 



It is true that we are become pretty well acquainted with Uncertainty of 

 what rnay be done by horfes in grinding malt, purapine; liquor ^^^^ meafure of 



1 : ■ ^ ' \^ L L\. r r . • 3 ^°^^- power 



and worts in breweries; but there are lo many fortuitous cir- from grinding or 



cumitances to be regarded, even here, that nothing decided pumping, &c. 



can refult from the clofeft inveftigation. For inftance, fome 



brewers chufe to have their malt ground much lower than 



others; tlie pump-work is executed in fome breweries under 



very different advantages, and from local circum fiances may 



be retarded by the inertia neceiTary to communicate motion 



from the wheel to the work, adding the different condition of 



valves, buckets, &c. All thefe confiderations demand fome 



iiivariabk refinance to be overcome by the exertion of the horfe, 



and I know of nothing fo appropriate as th*t X hJ^ve juft rpen- 



tioned. 



The power of a horfe (by yvhich I mean the mechanic DifEcuUy of 

 power) is not eafily afcertained. It has fcarce any analogy ^^'^ f^'l>j*i^» not 



Vox. XI.--TUNE, 1805. H with workl'but the. 



