G8 ANNUAL KECORD OF SCIENCE AND INDUSTRY. 



my. My other duties, as professor of mathematics and natural phi- 

 losophy, leave me but little time for regular astronomical work. I 



have been in charge of the observatory but a year, and the work in 

 that time, besides instruction, has been but little more than L>cttin<- 

 familiar with the instruments, testing their powers, determining er- 

 rors, etc. 



The transit of Mercury was observed last May, and the results 

 communicated to the U. 8. Naval Observatory. The longitude, 

 as approximately determined at that time, is 10 m 25.7 s E. of Wash- 

 ington. 



A Driving-clock will soon be attached to the Equatorial, after which 

 it is intended to make measurements of double stars as leisure per- 

 mits. 



New Haven, Conn. : Observatory of Yale College. 



In charge of Professor C. S. Lyman ; no regular assistants. 



Instruments. 1. A 9-inch Equatorial, by Alvan Clark & Soxs, 

 with Dricing-clock, Bijilar Position Micrometer, by Dolloxd; a Multi- 

 ple Ring Micrometer (four concentric rings with widths and spaces 

 equal) ; and a powerful Clark Spectroscope of seven prisms twice 

 traversed by the light. 



2. A Meridian Circle, by Ertel & Sons, altered by Youxg, with 

 5-foot telescope of 3.8 inches aperture, and two 40-inch circles read 

 by six micrometer microscopes. 



3. A Sidereal Clock, by Appleton, London, and another by How- 

 ard, Boston. 



4. A combined Transit Instrument and Zenith Telescope, of 3 feet 

 focus and 2.G inches aperture. This instrument, the earliest of the 

 kind, was constructed mainly in 1852-53, and is described in the 

 American Journal of Science and Arts, vol. xxx., 2d series, and in the 

 Proceedings of the American Association for the Advancement of 

 Science for 18G0. 



5. A portable Clark Refractor, of 5 feet focus and 4f inches aperture. 



6. Sextants, and other minor instruments. 



This observatory is connected with the Sheffield Scientific School, 

 and is used chiefly for purposes of instruction. The only observa- 

 tions published the past year were those of the transit of Mercury. 

 The city time is regulated by the observatory, as well as the chro- 

 nometers coming to this port. Mr. Wm. Beebe and Mr. II. A. Hazen 

 were in charge most of the year, in the absence of the director. 



Y'alc College has also a 10-foot Befractor, of 5 inches aperture, by 

 Dollond, and a 5-foot Transit Instrument, of 4 inches aperture, by 

 TBOUGHTOH & Si.m.ms. The former is used by students in the Aca- 

 demical Department, and is in charge of Professor Loomis. The 

 latter is not yet mounted. 



