PROCEEDINGS OF SECTION E. 287 
at the temperature of 52 deg. F., while the most recent question 
of the other comparisons results :— 
Brass bar = 1 m. + 0.443 mm. 
in consequence of which the brass bar appears to be too short 
by 5 # which is in thorough accordance with a comparison 
executed by Mr. Chisholm at London in 1870. 
The various comparisons carried out with the brass bar are as 
follows :— 
1. Ellery, 1864, Melbourne lm. + 0.4388 mm. 
2. Forster, 1869, Berlin 1m. + 0.447 mm. 
3. 1869-70, Berlin lm. + 0.459 mm. 
4, Chisholm,, 1870, London 1m. + 0.4387 mm. 
5, Baumann, 1872, Berlin... 1m. + 0.458 mm. 
6. Pensky and T. Baumann, 1880, Berlin... 1m. + 0.437 mm. 
7. Stadthagen, 1896, Berlin ... : 1m. + 0.442 mm. 
The mean value is, therefore, for the length of the brass bar 
=l1m. + 443.3 4 at 58 deg. F., if groups 3 and 5 are counted 
for one only. The agreement is very satisfactory, but it 
was ultimately resolved to adopt as a result — 
Brass bar = Im. + 445 pu. 
This value was made use of in wah eee the values of— 
L = 0.9929020 m., or 
g = 9.79955 m. not reduced to sea-level ; 
and 
L = 0.9929120 m. 
g = 9.79965 m. reduced to sea-level. 
The theoretical value for Montpellier terrace is, according to 
Helmert— 
¢ = 9.79953 m., 
and by that observation of minus theoretical value + 0.00002 m. 
We subjoin hereafter in addition a table containing the values 
of various determinations gravely at Melbourne acccording to 
Helmert.* 
| Theoreti- 
os 
| Longi- | UFZ Reduced | 
: . = a | cal Value 
Locality. |Latitude.| tude. | £9 |Observed.| toSea | Observer. roNe 
| E.@r. | £8 G. Level. | Pees 4 ae 
<8 Helmert. 
Page 144 | 87° 49.9'|144° 58.56'| 25 m. | 9.80013m.| 9.80020 m.| Gusroth, 1894) 9.79954m. 
‘afc caa Obs. ¥ e 26 ,, |9.80007 ,, | 9.80015 ,, | Miller, von 
| Elblein, 1893) 9.79954 ,, 
Page 177 = = — — — a a 
Melb’rne Obs. rf f 26 ,, | 9.79964 ,, | 9.79972 ., |Baracchi, Love! 
| 1893-94 9.79954 ,, 
Page 179 = oe a a 17 ee a = 
Melbourne 
Montpellier ss +3 181557 9279955 ,, | 9-7996L yt Neumayer, 9.79953 5, 
| 1863 
* ©. II. Allgemeine Konferenz der Internationalen Erdmessung in Berlin, 1895, IL. 
Part. 
Seite 144, 177, 179. 
+ From the earlier reductions previously quoted. 
