74 ANNUAL KECOKD OF SCIENCE AND INDUSTRY. 



1st. The personnel consists of myself and a volunteer assistant, Mr. 

 E. A. Engler, a graduate of the university. 



2d. Instruments. A Refractor, by Fitz, cquatorially mounted, and 

 of 17 centimeters (6.G9 inches) clear aperture. This instrument is 

 supplied with a Driving-clock and a Filar Position Micrometer. 



A Refractor of 7.5 centimeters (2.95 inches) clear aperture, univer- 

 sally mounted. This is about to be better adapted to transit-work. 

 To this may be attached a fine diagonal Micrometer Eye-piece for de- 

 termining latitude bv Talcott's method. 



A Sextant, by Geo. W. Blunt. 



3d. Observations. No regular observations are made except for 

 time, which is supplied to the city by means of a Central Regulator, 

 communicating by electricity with thirty dials situated at different 

 points. This summer I was a member of the party stationed at Fort 

 Worth to observe the eclipse of July 29. 



I have a Rutherfurd Diffraction -plate of 17,280 lines to 2.5 cen- 

 timeters, which I expect to have mounted so as to do some work in 

 solar physics. 



Tarrytowii, N. Y. : Private Observatory of C. H. Rockwell, Esq. 



In reply to your note of inquiry, I would say that my astronomical 

 outfit is so meagre, and the work done so unimportant, as scarcely to 

 merit a public notice. 



In company with Mr. Ward Carpenter, of this village, I made ob- 

 servations on the transit of Mercury on 6th May last, of which I sent 

 an account to the Naval Observatory, Washington, by request of Ad- 

 miral John Rodgers. The instruments used were a Telescope of 3J 

 inches clear aperture, a Mean-time Chronometer, No. 459, by Par- 

 kinson & Frodsiiam ; and an Engineer's Transit, with diagonal Eye- 

 piece, for time observations of stars. 



I went to Central City, Col., as a member of the party under the 

 charge of Professor Edward S. Holden, of the Naval Observatory, to 

 note the solar eclipse of July last. 



My interest in astronomical matters is largely on the side of math- 

 ematics, and the calculations which I make are only those of an am- 

 ateur. 



Troy, N. Y. : Proudfit Observatory. 



Professor D. Greene, Director. 



This observatory is the gift of Ebenezer Proudfit, Esq., of Troy, to 

 the Rensselaer Polytechnic Institute, and is just completed. It is 

 designed mainly to furnish facilities for the practical instruction of 

 students in astronomy. The building is of brick, and consists of a 

 central part thirty feet square and two stories in height, with north, 

 south, and east wings. The Equatorial room, in the second story, is 



