ON A QUARTZ THREAD GRAVITY BALANCE. 



243 



maximum or minimum readings. From the numerous observations taken we have 

 s.-l.M-!rci khoH pMuMtd undM toadHim '-' Mufy ppreadung fhoM \\!.i'-li \\.- 

 now know to be required. They are given in Plot 2. In the long series of obser- 



Plot 1. 



June 1097. 

 Readings reduced to 16 C. 



vations taken discontinuitirs appeared, amounting in one instance to 7 sextant 

 minutes. At this time the t\\< axles to which the thread was attached were 

 connected by a rectangular frame, intended to make both ends of the thread twist by 



J I 'J 



