246 



MESSES. E, THRELFALL AND J. A. POLLOCK 



The accident had the 



soldering of the lever to the thread was severely strained, 

 effect of permanently increasing the reading by 10. 



On November 6th the instrument was taken by train to Springwood, a station 48 

 miles west of Sydney, 1216 feet above sea level. It was here observed in the cellar 

 of the Oriental Hotel, and was brought back to Sydney the same night. Plot 4 

 shows that a break of 5'0 sextant minutes had occurred in the Sydney reading, and 

 that the daily rate due to elastic after-working (about 2'5 sextant minutes per day) 



Plot 5. 



to 



\aa o' 



40 



JO 



n 



(by of monkhl 



MeLLourne. 



75 a 10 II IZ to 14 15 16 17 13 19 



October iaaa. 

 Readings reduced to 21 C. 



had slightly increased. The balance was again taken to Springwood. On its return 

 the next day there was no definite evidence of a further break. But a third journey 

 on November 20th, returning to Sydney on the 23rd, strengthened the evidence as to 

 a permanent change taking place due to the travelling. When putting the 

 instrument into the train at Springwood on the 23rd, one of the handles of the box 

 broke, and one end of the box fell about two feet on the asphalte. The thread was 

 not broken, but the observation of the 23rd at Sydney differed by 1 (sextant) from 



