MERIDIONAL OBSERVATIONS. 217 



The places of Bradley 1730, 1731, 3058, and Groombridge 2053, which were 

 occasionally observed for Azimuth Error, have been brought up from the 

 Greenwich Catalogues for 1860 and 1864, and from the First Radcliffe 

 Catalogue. Professor Forbes always observed clock stars on the five wires 

 a, c, e, g, k. For complete transits the mean of the times has been reduced 



to the center wire by applying the correction - . g. 1 y-p-jy additive with lamp 



East. Each wire of the imperfect transits has been reduced to the center 

 wire by means of the intervals given at page 214. When a star has been 

 observed on one side wire only the clock time recorded is given at the foot of 

 the page. 



The observations of circumpolar stars, with reversed positions of the transit 

 axis, are separately reduced, and are occasionally very discordant ; partly in 

 consequence of the disturbing effect of the heat radiated from the illuminating 

 lamp, and partly, occasionally at least, from an apparent liability of the 

 Azimuth adjustment to be disturbed by the act of reversal, which was 

 performed by the hands. 



In the case of the Moon, the clock time of true transit over the Meridian 

 has been corrected for the amount of the Moon's motion in R. A. correspond- 

 ing to the sum of the instrumental corrections. 



The transits selected for publication are those observed for chronometric 

 connections, for the R. A. of the Moon's limb, and for the Ingress of Venus. 



ERRORS and RATE of the TRANSIT-CLOCK at KAILUA. 



"When the means of the " clock slow " obtained from stars observed with 

 lamp E. and lamp "W. are separately taken, and the one reduced to the other 

 by means of the rate, it is found that with lamp W. the clock is generally 

 more slow than with lamp E. as follows : 



s 



1874. December i 4- o'5o 1874. December 18 +0*12 



3 o-3i 21 + o-38 



4 + o'25 22 + o - 52 



6 + o'ig 28 + o'4O 



7 + 0-14 29 + o-i3 

 9 -j- o'56 3 1 0*04 



ii 4- 0-14 1876. January 2 + 0*42 



15 + 0-24 3 + 0-22 



16 + o-3i 4 + 0-20 



17 + 0-44 



