ON A QUARTZ THREAD GRAVITY BALANCE. 257 



the bearings. In April, 1897, we detected a mechanical irregularity due to this wear, 

 the axle of the sextant arm was working with too much friction ; this was remedied. 

 During May the instrument was considered to be fit to travel, and we took it to 



ri\\rlit'fls, a jil.-KV in tlic I5lur .Muiint:iilis. M.IIIC L'IIIHI t'rrt al,,.\r Sy< ln.-y. a!;. 1 !,.[ 



we made some promising observations. We have to thank our friend, Mr. FLINT, for 

 allowing us to use his house as an observing station, and for helping us in every way. 

 When we came to discuss these observations, we- found that it was now necessary to 

 improve the thermometry, and we accordingly made and tested the platinum 

 thermometer. By dint of some very continuous work we were able to get away to 

 Melbourne in June. An account of our work from this date is contained in the 

 paper. 



VOL. CXC1II. A. 2 L 



