absolute observations and adjustments. 

 Table 1. 



119 



Date. 



X. 



Corresponding 

 British 



Measures. 



Bifilar readin;;. 



X reduced to 

 420 Bifilar 



Scale. 



Correspouding 

 British 



Measures. 



C.G.S. 

 •00068707 

 617 

 472 



458 

 626 



539 



584 



557 

 4°5 

 457 



281 

 262 

 220 



237 

 287 

 328 



C.G.S. 



•o7'5345 

 6430 

 6396 

 6763 



6533 

 6570 



6521 

 6841 

 6^6s 

 6644 



6579 

 6786 

 6644 



67 JO 



6435 

 6683 

 7012 



Foot Grain Sec. 



1-6558 

 •6576 



•6,s69 

 •6648 



•6599 

 ■6607 



•6596 



•6665 

 ■6605 

 ■6623 

 •6^09 



•6623 

 •6637 



■6577 

 '66^ I 



•6703 



Scale division?, 



425 

 4'3 

 410 

 422 

 419 

 416 



423 

 425 

 408 



415 

 417 

 422 

 424 

 424 

 419 



433 

 440 



C.G.S. 



•076250 

 554 

 587 

 743 

 552 

 646 



464 

 746 



794 

 701 

 636 



748 

 568 



<534 

 454 



549 

 630 



Mean? 



■076604 



Foot Grain Sec. 



I ■'5537 

 • 6605 

 •6610 

 •6644 

 •6603 

 •6623 



•6584 

 •6645 



•66.55 

 •6635 

 •6621 



•6^45 

 •6606 

 •6620 

 •658. 

 ■6602 

 ■C620 



I ^6614 



The values, as reduced to tlie same bifilar reading (420), were plotted down to scale and a' 

 curve drawn through them. 



From this curve the following corrections were obtained for the change of zero of the 

 bifilar. 



There was reason to believe that the bifilar subsequent to its adjustment at the 

 beginning of September received a shock on the morning of October 2, at 3 a.m. This is 

 corroborated by the low value of X given by the observation of 29th September, and by the 

 siidden change in the readings at that time. 



The mean of the values of X from the last column of table 1 is * 076604, which 

 corresponds to 420 of the bifilar scale ; when the bifilar readings are corrected by Table 2, 

 this mean becomes • 076577. 



