318 



PRITCHARD S WEDGE PHOTOMETER 



In order to summarize the results of the prismatic measur 



in Tables III 



IV 



and V., all the observations taken on the same successive points of the 



have been grouped 



gether in Tables VII., 



wedge, though ou different days, 



VIII.. IX.. X., and XI. The numbers in each horizontal line have been divided 



" Thus in Table III., 



by the first number in the line, viz. that for " no ivedg 



91 



40.7 



224, 



47.5 

 174 



273, the numbers which begin the horizontal line opposite " July 



27 " in Table VII. below. 



TABLE VII. 



Wedge at 0.3 in. Slit 



2 mm. 



TABLE VIII. 

 Wedge at 1.8 in. Slit 



2 mm 



X 



C\4 



/ 



0^.5 



July 27 



37 



43 



" 27 



36 



41 



August 9 



37 



34 



i " 9 



20 



40 



" 9 



35 



• • • 



9 



27 



• • • 



August 10 



28 



53 



« 10 



36 



46 



" 10 



18 



33 



Means 



29.1 ± 2.0 



M .G 



40.8 ± 1.6 



U .7 



36.9 ± 1.2 



l'\0 



110 ± 2.0 



284 

 274 



314 



302 ± 5.0 



1 



