C. S. Peirce—Results of Pendulum Experiments. 327 
Art. XXXVI.—Results of Pendulum Experiments ; by C. 5. 
Perrce, Assistant Coast and Geodetic Survey. [Published 
by authority of C. P. Patterson, Superintendent. ] 
THE following are the results obtained from observations 
made by me, for the U. S. Coast and Geodetic Survey, at four 
important stations, for the purpose of comparing the lengths of 
the seconds pendulum, together with reductions to the sea- 
level and to the equator. In making the last reduction I have 
assumed the ellipticity to be = 1: 293, which is the latest result 
from measurements of ares. 
At station. At sea-level. At equator. 
Hoboken  0°9932052™ 0°9932074™ 0°9910003" 
i 0°9939337 0°9939500 0°9910132 
Berlin 0°9942399 0°9942482 0.9909865 
Kew 09941776 0°9941790 0°9910083 
9°; Kew * he following are the residuals of 
former observations according to Clarke (Geodesy, p. 349). 
New York +0°20°; Paris —3°29°; Kew +2°89°. 
Colonel Clarke has used a value of the ellipticity =1:292°2 
derived from pendulum experiments. This slight difference, 
however, is not important. ‘ , 
It should be explained that the result for Hoboken is derived 
from [T? Inv.] “Regular Set,” given on page 318, and also on 
be diminished by about twenty microns on account of the error 
in the standard used. 
