90 



TRANS. ST. LOUIS ACAD. SCIENCE 



log cot z^ ( = 3°40-5 9) = 1-192 



log s{ =2.89) ^ 0.461 



log / = 6.464 



log ^(z=:1.65) = 0.217 



a. c log (/-/o) 44-8 = 8-349 



log g 6.6S3 



q = 0.00048 



Hence the following table for the correction of the oscillation 

 series : 



where / * 



and 



z=. temperature of 

 oscillation series, 



z=z temperature of 

 deflection series. 



Determination of the Quantity P for the Work of the 

 Sufumer of 1878. 



Assuming the deflection formula 



^ ) r ., r ^^ 



the two determinations of made at each station with the de- 

 termined values 



ive, on the assumption that — ^ is constant for the two series 



p \ r^ tan u _ r'^ tan u' ) 



I r tan u _ r' tan zi. \ 



