Observations upon Wheel-Carriage Experiments. 253 

 riages have been weighed by Mr. Hutton at his yard, a difference 

 appears between the two weighing machines of about one quar- 

 ter ot a hundred in seven hundredweight; as this may have 

 arisen from difierence of weather, or from street dirt bein^ upon 

 the carnages at the time of weighing, or from Mr. Hutton's 

 machme benig mtended for weighing greater weights, I have in 

 consequence taken the trouble to prove, by stamped weights the 

 correctness of the Farming Society machine; and, on akin 

 weighmg the yellow car, I hnd it seven pounds lighter than be- 

 lore,— a kv/ hours dry weather may have produced this change. 

 I shall however make use of the weights taken in the first in- 

 stance, as those nearest to the weights at the time of the exneri- 

 ment. * *^ 



IJst of Weights. 



Weight of the yellow car without equalizing weights 7 ^' T 7 

 The wheels of this car . . i i a 



Axle :: ;; •• •• J 2? 



Springs and shackles ] ' j j X 



Weights called e(|ualizing weights fastened'to this car 1 

 Weight of green car without equalizing weights 7 2 11 



Axle 1 1^11 



•^*^'*^ 1 22 



Springs and shackles " " ' j q ^ 



Weig-lits called equalizing weights fastened'to this car 1 2 

 A body of common Scotch drav of Society yard 1 18 



I shall now endeavour ftirther to unravel and calculate the 

 effects of tae misleading circumstances, that escaped general 

 observation, and to simplify them so as to bring them fairlv into 

 view, and under such denominations as they are fairly entitled to. 

 The weight of the wheels and axle of the-yellow car appears to 

 have been lcwt.2qr,s.221bs. which being deducted from its 

 total weight lea^•es the weight of its embarrassing body, with its 

 weights called equalizing weight., (5 cwt. 2 qrs. 13 lbs The 

 weight of a body of a common Scotch dray of the Farming So- 

 ciety yard is Icwt. Oqr. ISlb. The embarrassing body, Ic is 

 .therefore 5 cwt 1 qr. 23 lbs. more burden than the bod^ of t'he 

 common Scotch dray, wdm-h for the purpose of elucidation f 

 will now suppose ^v.th that weight upon it, and placed upon the 

 rdH.H fi r .' i ""•' r'' '" '^'' ''^''S^'' ^-^^ subseuuentlv 

 tolwt Tr 9';'n'''^ "T"^'"' '"^^'^ '"'-^^"'^ "^^>^'"g together 

 «nH II t , '^'- ^' ''"'"'•^ mentioned. The weight of wheels 

 fmm i^« //i ^TV' •' ! ''''■ ^'^''- S'bs. which, deducted 

 t mm .t8 total weight, leaves the weight of its embarrassing body, 



wthrofh ,'i'^'^"'l't^ ""'«''^«' '-^'t- ^ Mr. 3 lbs. the 

 weight of body of a Scotch dray of Society yard, and springs and 



shackles 



