182 



REPORT 1859. 



Table XIIL 



Station. 



Makerstoun .... 



Gretna 



Dumfries 



Newton Stewart 



Stranraer 



Ayr 



Lamlash 



Helensburgh .... 

 Lochgoilhead . 

 Helensburgh .... 



Ardrishaig 



Oban 



Corpach 



Fort Augustus . 



Inverness 



Banff 



Peterhead 



Aberdeen 



Kintore 



Alford 



Braemar 



Pitlochry 



Larbert 



Edinburgh 



Date. 



1857. 



Aug. 10 



15 



17 



18 



19 



20 



22 



22 



25 



28 



29 



Sept. 3 



3 



4 



7 



8 



9 



11 



16 



17 



19 



21 



22 



24 



28 



1 



5 



Oct. 



Total force. 



(1) By 



Dr. Lloyd's 



method. 



10527 

 10-475 

 10-497 

 10530 

 10-531 

 10527 

 10-529 

 10-525 



*10-571 

 10-551 

 10-547 

 10-561 

 10-564 

 10-560 

 10-582 

 10-685 

 10-663 

 10-673 

 10-576 

 10540 

 10-567 

 10-610 

 10 594 

 10-564 

 10-551 



+10-541 

 10-522 



(2) By the 

 method of 

 vibration. 



10-548 

 10-505 

 10-519 

 10-523 

 10-523 

 10-519 

 10-548 

 10-548 

 10-595 

 10-538 

 10-531 

 10-538 

 10-538 

 10-575 

 10-560 

 10-702 

 10-647 

 10-668 

 10-596 

 10-582 

 10-543 

 10-550 

 10-599 

 10-587 

 10-535 

 10-552 

 10-536 



(2)-(l) 



+ •021 

 +•030 

 + •022 

 -•007 

 -•008 

 -•008 

 + •019 

 + •023 

 + •024 

 -•013 

 -•016 

 -•023 

 -•026 

 + 015 

 -•022 

 +•017 

 -•016 

 -•005 

 + •020 

 + •042 

 -•024 

 -•060 

 + •005 

 + •023 

 -•016 

 + •011 

 + •014 



* Altered the western Y of the lifter before taking this observation. Again at Oban. 

 t Tightened screws before this observation. 



It appears from this Table, that, considering the results obtained by the me- 

 thod of vibrations as standards with which to compare those obtained by Dr. 

 Lloyd's process, the latter are found to differ in several instances considerably 

 from the former, sometimes in a positive and sometimes in a negative di- 

 rection. Proceeding now to the observations of 1858, I find that these were 

 taken with the face of the deflected needle to the west. They are therefore 

 comparable with the five observations taken at Kew during June 1858. The 

 mean of these five observations gives 1021 9 as the value of the total force at 

 Kew. This is -08 less than the probable value ; so that we ought to add this 

 amount to all the observations taken by this process during 1858. We thus 

 obtain, as before, the following table, in which the results of the two methods 

 for 1858 are compared together : — 



