=y 
Himxnava Movunrars, 955 
brass scale. They are all reduced to one certain division of the | ses 
1.2 -2.3 4—4,5 
Old ie New Scale, 
scales that is to 2300 —«Q-547 or 0-237. 
A 
Length of the Rods. 
Pair 
Pair : re th of | Reduced to 
| Month. | Date.| 99 3| Nonius. |. 4° 4 ,| Noniue. i hevet. | Comm liven Comp. 
Inches. aches. p  Enches. | 
i February,| HS §99:917 | 0:6450.| 1199-882 | . 988 1200026 
6s 599°936 °650 O.| 1199-924 1023. "035 
| ay | 599:905 | -320N.! 1199-900 900 128 
23 600-001 °284.N.| 1200054 } 1064 °126: 
25 }599:910 | 0-776 |600-160 | -315N.| 1200-243 | 1328 | 066 
27 |§99:970*| 0775 {599:970*] -240N.!_ 1200-073: $209 "009 
‘ March,} ' 2 1599-:890* "700 |599°890*} -335N.| 2299-987 © | 1106 “020 
3 §99:920 "285 N.| 1199-892 | 1046 1199'981 
Mean of former 4& determinations, .......0..¢0e000++ | 1200119 1203. 1200-061 
Mean of the whole,...... oral lelalsjccsiers | 1200-049 1141 
Onvfeetetic crt. cepetvic terse 100:C04 1. 
Tur extreme difference in the above,.as reduced to the same state of the 
comparator, is only °147 inch, on 100 feet, or 012 feet. Half this quantity 
or 006 re may be taken as the extreme probable error on the mean result, 
that is ;,,, of the whole or on the base 1.2 foot. 
f 
38. In making the comparisons with the chain, the latter was placed 
upon boards, supported by the rod-stands ; a draw post of 5 feet in length, 
driven firmly into the ground, held it at one-end; at the other it was stretched 
by a weight attached to a rope, passing over a pully in the weigh post. 
SSS ee 
* Iw these two operations the pairs were meas ured together, the quantities inserted in the columns 
arc half the length found for the 4 rods, 
aR 
VOL. XIV. ‘ 3 kT 
