and on Astronomical Refractions. 



VI I 



JEther. 



Alcohol. Sp. gr. 0-813. 



Petroleum. 





Temp. 







Temp. 







Temp. 







Temp. 





>ssure. 



calc. 



T 



Error. 



Pressure. 



calc. 



T 



Error. 



Pressure. 



calc. 



r 



Error. 



Pressure. 



calc. 



T 



Error. 



nch. 



o 



o 



Inch. 



O 



o 



Inch. 



o 



o 



Inch. 



o 



o 



6-20 



30-8 



-3-2 



0-40 



33-6 



+ 1-6 



46-60 



193-6 



+0-3 



30-00* 



3160 



0-0 



8-10 



42-2 



-1-8 



0-56 



42-8 



+2-8 



5010 



197-1 



+0-8 



3170 



320-1 



+0-1 



0-30 



52-9 



-11 



0-70 



48-1 



+3-1 



5300 



199-9 



-0-1 



34-00 



325-4 



+0-4 



3-00 



63-5 



-0-5 



0-86 



53-3 



+3-3 



60-10 



206-3 



+0-3 



36-40 



330-7 



+07 



0-10 



73-6 



-0-4 



1-00 



572 



+2-2 



65-00 



210-3 



+0-3 



38-90 



335-5 



+0-5 



0-00 



84-2 



+0-2 



1-23 



62-6 



+2-6 



69-30 



2137 



-0-3 



41-60 



340-7 



+0-7 



4-70 



94-9 



+0-9 



1-49 



67-8 



+2-8 



72-20 



215-8 



-0-2 



44-10 



345-3 



+0-3 



0-00* 



1050 



0-0 



1-76 



72-4 



+2-4 



78-50 



220-3 



+0-3 



46-86* 



350-0 



0-0 



2-54 



109-3 



-0-7 



210 



774 



+2-4 



87-50 



226-2 



+ 1-2 



50-20 



355-4 



+0-4 



5-90 



114-7 



-0-3 



2-45 



81-9 



+ 1-9 



94-10 



230-2 



+0-2 



53-30 



360-2 



+0-2 



9-47 



119-9 



-01 



2-93 



87-3 



+2-3 



97-10* 



2320 



00 



56-90 



365-4 



+0-4 



3-24 



125-0 



0-0 



3-40 



91-8 



+ 1-8 



103-60 



235-6 



-0-4 



60-70 



370-7 



+0-7 



7-14 



129-8 



-0-2 



3-90 



96-1 



+ 1-1 



106-90 



237-4 



-0-6 



61-90 



372-3 



+0-3 



1-90 



135-4 



+0-4 



4-50 



100-7 



+0-7 



111-24 



239-8 



-0-2 



64-00* 



3750 0-0 



6-90 



140-8 



+0-8 



5-20 



105-4 



+0-4 



118-20 



243-3 



-0-7 





1 



2-10 



145-9 



+0-9 



6-00 



110-2 



+0-2 



12210 



245-2 



-1-8 



Oil of Turpentine. 



7-60 



1510 



+1-0 



710 



1160 



+ 1-0 



12610 



247-1 



-0-9 









3-60 



156-2 



+ 1-2 



810 



120-7 



+0-7 



131-40 



249-6 



-0-1 



Pressure. 



Temp, 

 calc. 



Error. 



0-30 



161-6 



+ 1-6 



9-25 



125-5 



+0-5 



132-30 



250-0 



0-0 





T 





6-40 



166-2 



+ 1-2 



+0-8 



10-60 



130-5 



+0-5 

 +0-6 



138-60 



252-8 



+0-8 

 + 1-6 









2-80* 



170-8 



1215 



135-6 



143-70 



255-9 



Inch. 



O 



o 



910 



175-0 



0-0 



13-90 



140-8 



+0-8 



151-60 



258-3 



-0-3 



30-00* 



3040 



0-0 



8-30 



180-8 



+0-8 



15-95 



146-3 



+ 1-3 



155-20 



259-8 



-0-2 



32-60 



310-5 



+2-9 



6-10 



185-4 



+0-4 



18-00 



151-1 



+1-1 



161-40 



262-2 



+0-2 



33-50 



312-7 



+27 



4-80 



190-2 



+0-2 



20-30 



156-1 



+1-1 



16610* 



264-0 



00 



35-20 



316-6 



+1-6 



3-70 



191-9 



-0-1 



22-60 



160-7 



+07 









37-06 



320-6 



+0-6 



2-80 



199-5 



-0-5 



25-40 



165-7 



+0-7 









37-80 



322-2 



+0-2 



1-30 



203-5 



-1-5 



28-30 



170-4 



+0-4 









40-20 



327-1 



+1-1 



6-00* 



210-0 



0-0 



30-00* 



173-0 



o-o 









42-10 



330-8 



+0-8 









33-50 



178-0 



-0-3 









45-00* 



336-0 



00 









34-73 



179-6 



-0-4 









47-30 



340-0 



0-0 









36-40 



181-8 



-0-5 









49-40 



343-4 



+0-4 









39-90 



186-1 



+0-8 









5170 



347-0 













43-20 



189-9 



lo-i 









53-80 

 56-60 

 58-70 

 60-80 

 62-40* 



350-2 

 354-3 

 357-1 

 359-9 

 362-0 



+0-2 

 +0-3 

 +0-1 

 -01 

 0-0 



The observations marked with an asterisk are those which were 

 employed in procuring the constants /3, E. 



The aether which was observed by I)r. Ure below the pressure 

 of 30 inch, appears to have been slightly different in quality from 

 the other ; in estimating the comparison this circumstance should 

 be borne in mind. 



T 2 



