306 



THE SAYKE OBSEEVATOEY. 



other stars employed. This seems to have been due to the time required for the star to 

 pass over the length of the screw. This was about l h 20 ra , the instrument being liable to 

 considerable; changes in this interval. 



The range of observation was usually twenty-four revolutions, viz. : from scale 

 reading 8 to 32, 20 being regarded as the middle of the field. The correction from 

 progressive error, to be spoken of later, was applied when appreciable. 



Assuming the value of one revolution to be 50". 5, each determination gives an 



equation of the form 



li — 50".5 = a + {T— 4r>o) y 



Where R is the observed value of one revolution, 

 x the correction to the assumed value, 

 y the temperature coefficient, 

 T the thermometer reading. 





Dale 





Star 



Elong, 



Observed A' 



Thermom, 



T—UP 



R- 



- m".r> 



1 



1889 Dec. 



13 



51 Cepliei 



.15 



50'.527 



45° 5 



+ 0°.5 



+ 



.027 



2 



1890 .Tun. 



14 





E 



.523 



34.8 



— 10.2 



+ 



.023 



3 





27 





W 



.483 



31.9 



— 13.1 





.017 



4 



April 



2 





w 



.529 



36.6 



— 8.4 



+ 



.029 



5 





5 





w 



.488 



37.5 



— 7.5 





.012 



6 





18 





w 



.485 



37.0 



— 8.0 





.015 



7 



Oct. 



17 





E 



.501 



54.5 



-|- 9.5 



+ 



.001 



8 





21 





E 



.532 



44.3 



— 0.7 



+ 



.032 



9 





30 





E 



.518 



38.1 



— 6.9 



-1- 



.018 



10 



Nov. 



6 





E 



.508 



45.1 



+ 0.1 



+ 



.008 



11 





10 





E 



.527 



43.0 



— 2.0 



+ 



.027 



12 



Aug. 



15 



43 Ccphei 



E 



.456 



68.8 



+ 23.6 





.044 



13 





23 





E 



.465 



67.9 



+ 22.9 



— 



.035 



14 





23 





E 



.498 



55.5 



| 10.5 







.002 



15 





24 





E 



.517 



54.4 



+ 9.4 



+ 



.017 



16 





24 





E 



.511 



54.4 



+ 9.4 



+ 



.011 



17 





27 





E 



.485 



71.1 



| 26.1 





.015 



18 





30 





B 



.489 



64.1 



+ 19.1 



, 



.011 



19 



Oct. 



30 





W 



.472 



36.0 



— 9.0 







.028 



20 





30 





w 



.487 



35.6 



— 9.4 



— 



.013 



21 





31 





w 



.485 



36.6 



— 8.4 





.015 



22 





31 





w 



.506 



36.6 



— 8.4 



+ 



.006 



23 



Nov. 



4 





w 



.476 



32.3 



— 12.7 





.024 



24 





4 





w 



.498 



31.4 



— 13.6 







.002 



25 



1889 Dec. 



27 



6 Ursoe Minoris 



w 



.467 



41.1 



— 3.9 



— 



.033 



20 





27 





E 



.508 



34.2 



— 10.8 



+ 



.008 



27 





28 





w 



.462 



40.9 



— 4.1 





.038 



28 



1890 Oct. 



17 





w 



.511 



56.1 



+ 11.1 



+ 



.011 



29 





17 





w 



.531 



50.1 



+ 11.1 



+ 



.031 



30 





21 





w 



.531 



45.5 



+ 0.5 



+ 



.031 



31 





21 





w 



.502 



44.3 



— 0.7 



+ 



.002 



32 





30 





w 



.544 



41.3 



— 3.7 



+ 



.044 



33 





30 





w 



.543 



37.2 



■ 7.8 



4- 



.043 



34 



Nov. 



6 





w 



.491 



47.6 



A 2.6 





.009 



35 











w 



.473 



45.6 



+ 0.0 



— 



.027 



36 





10 





w 



.530 



44.2 



— 0.8 



+ 



.030 



37 





10 





w 



.522 



44.2 



— 0.8 



+ 



.022 



