Hourly Observations of Magnetometers, November 5 — 11, 1844. 



59 



Nov. 8*1 20*" — 23*'. Workmen engaged laying carpets ; it is feared that some one must have brought a hammer near the balance 

 magnet between 21*" 0" and 30", as the reading had changed about 13 mic. div. ; the time of vibration had also clianged since the 

 previous day. 



