206 



Prof. C. Pritchard. 



As far as the general mass, or great majority, of these observations 

 is concerned, it is not necessary to give all the particulars, but I have 

 selected the first sets of measures as affording an average specimen of 

 the whole work. These results are exhibited in Table IV; and in 

 Table V are given the mean deviations of the whole twenty-five stars, 

 deduced as in the case of the six for which the complete details are 

 printed in Table IV. 



Table IV. — Comparison of Relative Accordances of the Photographic 

 Measures of Distances of Stars from Alcyone inter se, with similar 

 measures made by Bessel. 



Number of 

 plate. 



Distance measured 



Deviation from the mean 



On 



photograph. 



With 

 heliometer. 



On 



photograph. 



In 



heliometer. 



Star 7. 



Plate I 



„ HI 



„ IV 



Mean .... 



1355 -65 

 1355-11 

 1355 -43 

 1355-32 



1355-02 

 1355 39 

 1354-74 

 1354 -76 



// . 

 0-27 

 0-27 

 0-05 

 0-06 



0-04 

 0-41 

 0-24 

 0-22 



1355-38 



1354-98 



0-16 



0-23 



Star 8. 



Plate I 



II 



„ III 



„ IV 



Y 



„ YI 



Mean .... 



1081 '39 

 1080 -68 



1080 - 79 

 1080 -85 



1081 -04 

 1080 -52 



1080-27 

 1080 -48 

 1080 -40 

 1080 -25 

 1079 -62 

 1079 -85 



0-51 

 0-20 

 0-09 

 0-03 

 0-16 

 0-36 



0-12 

 0-33 

 0-25 



o-io 



0-53 

 0-30 



1080 -88 



1080 -15 



0-22 



0-27 



Star 9. 



II 



» in 



„ iv 



Mean .... 



1045 -12 

 1045 -21 

 1045 -00 

 1045-13 



1045 -07 

 1045 -06 

 1044 -88 

 1044 -39 



00 

 0-09 

 0-12 



o-oi 



22 

 0-21 

 0-03 

 0-46 



0-23 



1045-12 



1044 -85 



0-05 



