OF ARTS AND SCIENCES. 181 



from which we derive the normals : — 



0= 0.00 + 12.00 Jt+ 10.14 a + 5.06 c, 



= + 8.22 — 10.14 J t-{- 41.62 a + 18.07 c, 

 = — 37.56 — 5.06 J z -\- 18.07 a + 122.88 c. 



The solution of which gives 



J T = — 0.175, 

 a = — 0.395, 

 c = -\- 0.357, for Circle East. 



But, deriving our final value of zJ r from the time stars only, we have, — 



for Circle East, = + 0^26 + z/ t — 0M7 + 0'.38, 

 = + .47 + J T — .27 + .36, 

 = — .13 + J T — .02 + .47, 

 r= 4- .22 + z/ T — .22 + .36 ; 



and for Circle West, = + .70 + J r + .01 — .49, 

 = + .86 + J r -f- .28 — .76, 

 = + 1 .18 + z/ T — .30 — .36, 

 = -f .93 4- z/ T — .02 — .46. 



From which we derive 



z/t = — 0'.402 ± 0^031, 

 and r + J T = — 42.855 — 0^402 ± 0S031 ; 



whence the Bond clock is fast of the sidereal time at the Waltham 

 Station 



43'.257 ± 0'.031, 



as determined by C. V. Woerd. 



From observations made of the stars ^ Lacertas, d Cephei, and i 

 Cephei, at Waltham, on the evening of Oct. 22, 1877, it was found 

 that on that evening L. Waldo observed an equatorial star 0^269 

 before C. V. Woerd observed the same star. 



The Russian transit pier, at Harvard College Observatory, is 44.5 

 feet West of the centre of the dome, to which longitudes are usually 

 referred. 



