Viii CONTENTS. 



Tuscaloosa (Alabama) observatory, 258 



Mr. Rutherford's observatory, New York, 260 



Friends' observatory, Philadelphia, 262 



Amherst College observatory, 263 



Charleston (South Carolina) observatory, 264 



Dartmouth College observatory, 265 



Mr. Yan Arsdale's observatory, 270 



Shelby College observatory, 212 



Buffalo observatory, 273 



Mr. Campbell's observatory, New York, 275 



Observatory of Michigan University, 277 



Cambridge (Cloverden) observatory, 2 SO 



Dudley observatory at Albany, 281 



Hamilton College observatory, . . 284 



SECTION IL 



ASTRONOMICAL EXPEDITION TO CHILI, . . . . . . 293 



SECTION III. 

 ASTRONOMICAL RESULTS or PUBLIC SURVEYS, . . . .300 



SECTION IT. 



APPLICATION OF THE ELECTRIC TELEGRAPH TO ASTRONOMICAL USES, 304 



Experiments between New York and "Washington, . . . 305 

 Experiments between New York and Cambridge, . . . .310 



The electric circuit broken by a clock, 313 



Mode of registering the observations, 325 



Observations for longitude since the autumn of 1848, . . . 330 



Application of the electric circuit to astronomical observations, . 341 



Application of the electric circuit to astronomical uses in Europe, . 345 

 Experiments made in Europe for the determination of geographical 



longitude by the electric telegraph, 349 



Determination of the velocity of the electric current, . . . 357 

 Differences of declination recorded by electro-magnetism, . . .364 



SECTION V. 



ASTRONOMICAL PUBLICATIONS, 368 



SECTION YL 



THE MANUFACTURE OF TELESCOPES IN THE UNITED STATES, . .375 



Reflecting telescopes, 375 



Refracting telescopes, . . . 377 



Manufacture of glass for'optical purposes, 378 



Fitz's telescopes, 385 



Clarke's telescopes, . . 389 



Spencer's telescopes, . 392 



