248 _ AN ACCOUNT OF THE 
From the data, and the radius, 43 inches, we get, 
fd =  :104839 
fe= 10021 
Consequently ed = “0465 
_ Now @ was the mark of 300:9419 inches. 
eed 
Therefore a bor c was, 3008956 or on 1.2—25-758 
Add, “1044 pa “444 
Inches. 
Consequently, .....066 SOLO0000 j= to 16°202 divisions. 
30. A SECOND comparison was. made, in which arcs were drawn from 
‘both rods, and great care taken: the result, which to avoid prolixity it is 
not thought necessary to detail, was that the 301 mches, on 2.3 corres- 
ponded with the division,.......5. IGLIS 
By the preceding, “202 
Mean, 16°160 Comp. 1170: 
Bb measures on 1.2, 16:092 1217 
Mean of 8, 16°109 1203 
Tue difference of the above results when reduced to the same state of 
the comparator, is only °009 inches. From the mean, we also get the length 
