SOLAK ECLIPSE, MAY (i, 1.S83. ] 39 



connected with chronometer 158!) Negus. I observed the first contact at C. T. 1'' ()"' :i~)^. I am 

 sure it was at least 5 seconds hite, and so recorded immediately after marking the time. 



I. IV. 



k. HI. A-. b. Ill, s. 



C. T 1 to :r).(M) .1 8 1 



C. Cor ^'.•.ti4 .. .. :in. i;! 



L. S. T 1 1 I. (it 4 8 :!i. i:i 



s. R. A a 5:5 i-z.:M -z r>7 38.y 



Sid. Int -^i 7 22.27 1 Id .^2.23 



Cor 3 37.45 .. .. 11.62 



L. M. T 10 3 44.82 5 sccoikIh l<ati'. 1 10 40.61 



III. — Pendulum and latitude observations. 



At the request of the Superintendent of the Coast and Geodetic Survey, Prof. J. E. Hilgard, 

 I assisted Mr. Preston in the Pendulum Observations at Caroline Island. Mr. Preston in his 

 report has given a full account of tlie instruments employed; I will only report concerning my 

 share of the observations. 



Before leaving Washington I received instructions at the Coast and Geodetic Survey office as 

 to the methods : and assisted, during the week previous to leaving Washington, in the necessary 

 preliminary observations at the Smithsonian Institution. 



On Caroline Island 1 was bu.sily engaged from the 22d to the 25th of April in unpacking and 

 setting up the pendulum apparatus and assisting in setting up and adjusting the transit instrument. 

 From the 25th to the 29th, inclusive, I observed pendulum transits from 7 p. m. until 5.30 a. m. the fol- 

 lowing morning. On April 30, May 1, 6, and 7, 1 observed from 7.30 p. m. to 2 a. m., Mr. Preston 

 relieving me at that hour. 



On May 4, 6, 7, and 8, in addition, I made observations with the reversible transit instrument 

 for latitude. Mr. Preston has detailed in his report the difficulties encountered by warping and 

 slacking of micrometer spider lines ; the one he finally succeeded in getting taut enough having a 

 diameter of 8". In many of my observations for latitude I found it necessary to bisect stars oft' 

 the middle thread, and accordingly I was obliged to determine the inclination of the micrometer 

 thread. The manner and results will be found in Mr. Preston's report. I will only say in regard 

 to my observations for latitude that, considering the difficulties under which they were made, I 

 am more than pleased with the accordance of the results. I have made a preliminary reduction 

 of 22 pairs which gave me a latitude of 



S 10° 0° 1".30 ± 0".47 



This I expect will not differ from the final, except in giving a somewhat larger probable error. 



Eespectfully, 



S. J. BROWN, 



Unsign, U. 8. N. 



(g.) REPORT OF LIEUT. E. F. QUJLTROUGH, U. S. NAFT. 



U. S. Steamer Hartford, 



At Sea, May 14, 1883. 

 Prof. Edward S. Holden, 



Chief of TJ. 8. Eclipse Expedition to Caroline Island, 1883 : 



Dear Sir : In accordance with your request, I volunteered to join the Eclipse Expedition, and 



to conduct the photographic observations, with the photoheliograph brought by Messrs. H. A. 



Lawrance and O. K. Woods, the English scientists sent out by the Royal Society of England. 



