288 PROCEEDINGS OF SECTION E. 
According to subsequent investigations of Helmert there 
ought to be applied another correction of + 0.00035 m. If 
the correction is applied the theoretical value for Melbourne, 
in the level of the sea, is 
g = 9.79989 m. 
and the value of g from observations minus ae theoretical 
value of g for Montpellier terrace — 0.00023 1 
With regard to this value of g, it is but es to state that 
the are of oscillation during the observations had to be rather 
large at the commencement, in order that observations might be 
extended over a time one anda quarter to one and a half hours. 
At the commencement the amplitude sometimes amounted to 
65 min. of arc, decreasing towards the end to 15 mun. of are. 
By more recent investigations it was established that the are 
of oscillation being of the amount just stated, the sliding of the 
knife-edges upon the agate planes could not be avoided, and 
would have to be taken into consideration—that is to say, the 
change thus caused is to be applied as a correction to the final 
result. However, it was not deemed necessary to enter into dis- 
cussion of this matter for want of an exact basis to go by; the 
correction was consequently neglected. The original observa- 
tions, which shortly will be published in full, contain the are of 
oscillation for each series, which may perhaps give an oppor- 
tunity to carry out that investigation with a view to determine 
the amount of the said correction. 
The temperature in the room for observing the coincidences 
and measuring the various lengths was very uniform throughout 
the whole series, and oscillated but a few degrees F., so that no 
difficulty could exist in reducing the length of the brass bar and 
the pendulum to a normal temperature, which was adopted to 
be 58 deg. F. 
REMARKS By Pror. HELMERT ON THE DETERMINATION OF THE 
VALUE OF g AT MELBOURNE COMPARED WITH THOSE 
OF OTHERS. 
It was already stated that the observations with the Loh- 
meier pendulum could be compared in a relative manner with 
some oi the determinations by Peters and Bessel in Germany. 
If we reduce the various results derived from observations with 
Lohmeier’s pendulum to the last equation for the length of the 
brass bar, above stated, we obtain the following results :— 
Melbourne ... se tee La = 0,9929120)m: a9 F996 an. 
Altona she : “ee i ='0.9943043 in: go "981339 m 
Berlin aes 0/094 Ta. Tete Res ADAG ie 
Koenigsberg, E.P.. L = 0.9944077 eg. 9.81441 m. 
