on Agricultural Implements. 



623 



those exhibited consumes three times more coal than the best. 

 Mr. Locke. M.P., whose engineering experience gives weight to 

 his judgment, thinks that in other respects too they might be 

 still further improved : — 



'To P. Pusey, Esq., M.P. 



London, 11, Adam-street, Adelphi, 

 Dear Sir, July , 1851. 



The detailed Report of Mr. Carr, of the results of the experiments 

 made on the portable steam-engines, has already been presented to the 

 Jury over which you preside ; and as you desired from me a short state- 

 ment of my views of Mr. Carr's Report, I beg to send you the following : — 

 You will find in the tabular statement of the consumption of fuel, that 

 the several makers stand in the following order of excellence : — 



Messrs. Hornsby and Son 6 '79 lbs. per horse power. 



,, Tuxford and Sons 7 '46 



Clayton, Shuttleworth, and Co. .8*63 

 Barrett, Exall, and Andrews . . 9*20 

 ,, Garrett and Son 11*65 ,, 



Clayton, Shuttleworth, and Co.'s, to test the comparative strength of the Llangennech 

 and Newcastle coals, she worked out to a decimal the same number of pounds of coal 

 burnt per horse-power per hour as her competitor, which, allowing for the proved dif- 

 ference in the strength of the coal in favour of the Welsh, would have given Messrs. 

 Garrett 8' 63 lbs. of that coal burnt per horse-power per hour instead of 11*65, as 

 shown in the tabular statement ; whicii more favourable result I think them quite en- 

 titled to, as the derangement in the slide was purely accidental. 



Messrs. Clayton and Co.'s engine was exceedingly simple, and worked well; the 

 governors had perfect control during the trial, which was passed through with great 

 stead uiess and credit to the makers. 



As regards the other engines, I will proceed to notice them in the order as tested : — 



Messrs, Hensmau and Son's 4-horse, of moderate Avorkmanship, was evidently the 

 production of a novice. The boiler was too small for the power, and the consumption 

 of Cuel more than as much again as most of the tirst-class engines. 



Mr. Butlin's Ji-horse : workmanship moderate ; arrangement of working parts sim- 

 ple ; and duty done for coal consumed fair when compared with others of its class. 



Mr, Caborn's 9-horse : workmanship moderate ; arrangement of engine ill designed ; 

 and entire weight far too great to be generally suitable for a portable engine, rhe 

 boiler being a large one, with considerable healing surface, the duty done was com- 

 paratively good. 



Messrs. Barrett, Exall, and Andrews' 4^-horse : workmanship moderate. The 

 cylinder and crank-shaft bearing in this engine were placed upon the same base-plate, 

 which was bolted to the boiler, an arrangement giving superior strength and steadiness in 

 working. These makers adopted a link motion, controlling the slide-valve and worked 

 in connexion witli the governor, which we think a very needless complication, and 

 worked very unsteadily. The boiler was large for the size of the engine, and the 

 duty done for coal consumed was more nearly approaching its first-class competitors ; 

 so that, as a whole, I cannot speak less than favourably of the engine, 



Mr. Burrell's 6-horse : workmanship fair, and arranjrement of working parts simple 

 and good, and consumption of fuel comparatively moderate; so that in this case also 

 I must rejxivt favoural)ly. 



Messrs. Roe and H.mson, Strand, London, 4-horse: workmanship very inferior; 

 general arrangement ill-designed asid clumsy ; and cast iron used freely in the place 

 of wrought. The coal consumed for duty done was three times that of the best 

 engines. 



Messrs. Ransomes and May brought an engine to the trial-yard, but from some cause 



