II 
DEPARTMENT OF ASTRONOMY. 
In charge of Mr. Charles A. Post. 
44. PHOTOGRAPHS OF STELLAR SPECTRA. Showing spectrum 
between F. and D.—that portion most easily observed by the 
eye. These plates are important as an evidence that pho- 
tography is superior to the eye, even on its own ground. Ex- 
hibited by Prof. James E. Keeler, Allegheny Observatory. 
44a. GLASS POSITIVES of Comets and of the Milky Way, made 
with 6-inch Willard Portrait lens of 31 inches focus. Exhibited 
by Prof. E. E. Barnard, of the Lick Observatory. 
446. PHOTOGRAPHS OF DRAWINGS OF Mars. By Percival Lowell, 
Lowell Observatory. 
45. PHOTOGRAPHS OF LIGHTNING. Exhibited by Samuel W. 
Bridgham, M.E., President New York Camera Club. 
46. PHOTOGRAPHS OF THE SUN DURING TRANSIT OF MERCURY, 
November 10, 1895. Showing an approximate method of de- 
termining the heliographic latitude and longitude of a point on 
the sun’s disc. Exhibited by Charles A. Post, Strandhome 
Observatory. 
47. IMPROVED FORM OF SMALL TELESPECTROSCOPE. By John 
A. Brashear. Exhibited by Charles A. Post. 
There are exhibited by the Columbia College Observatory, J. 
K. Rees, Director, the following: 
48. MEASURING (MICROMETER) MACHINE FOR ASTRONOMICAL 
PHOTOGRAPHS. By Repsold & Sons, of Hamburg. 
49. REFLECTING CIRCLE, with stand and new form of Artificial 
Horizon. By Wanschaff, of Berlin. 
50. SEVERAL PHOTOGRAPHS, made by the astronomers of the 
Lick Observatory, of the Moon, Sun’s Corona, and Comets. 
51. A LARGE POSITION MICROMETER of new design, by Saeg- 
muller, of Washington. 
52. A NEW EIGHT-INCH ASTRONOMICAL THEODOLITE, by Saeg- 
muller. 
35. A SMALL FouR-INCH THEODOLITE, by Saegmuller. 
