254 AN ACCOUNT OF THE 
19-28 34-45 
Wew Scale, 
The Nonii marked, 0-663 and 0-309 
Now ‘129 inch = divisions, ‘516 
Consequently,..eeee000¢2 4:179 corresponds to 0-309 New Scale. 
The other comparison which was-made as befoze noticed, after the 
straightening of the rods gave as the result. 
1.2—2.3 | 3.4—4.5 
Old Seale. ew Seale, 
1-315 0476 0220 
Now from the operations formerly detailed, it was found that the corres- 
pondence of the Noni was.as follows: 
12-23 3.4—4.5 
1-072 796 Old Scale. 
‘These three expressed 1m the 3 scales will stand as follows: 
2-23 3.445 
Old Scale. New Scale, 
1:179 0°709 0-309 
1-315 0-470 0-220 
1022. ove 0-796 0-339 
Mean, 1189 0°658.. 0°289 » 
37. Wlavine thus established the relations which the several scales bear 
to each other, we can from the length of one pair deduce that of the 
other, and consequently of all four rods. ‘The following table shows the 
resulting length as deduced from the several operations performed with the 
5 reo) Y 
