Il. 
II 
8. Spectrum of Venus, with simultaneously photographed 
sky spectrum, November 12, 1895. This photograph 
was made with a diffraction grating (3d spectrum, 
H;) and a camera of 28 in. focus, and shows the highest 
dispersion that it has been practicable to use so far. 
Made in connection with experiments, not yet com- 
pleted, on the possibility of determining the rotation 
period of Venus by spectroscopic methods. 
9. Solar Spectrum, same apparatus as for No. 8, showing 
the definition of the instrument under favorable cir- 
cumstances. ; 
10. Enlargement of Spectrum of Saturn, April 17, 1895. 
11. Enlargement of Spectrum of Saturn, region of Hy, 
May 16, 1895. By Prof. W. W. Campbell, with the 
Lick Spectrograph. (Astrophysical Journal, August, 
1895. ) 
S1x-incH EquaToRIAL TELESCOPE. New Model. 
IMPROVED FILAR MICROMETER. 
PHOTOGRAPHS OF LARGE EQUATORIALS. 
Nos. 3-5 exhibited by Messrs. Warner & Swasey, 
Cleveland, O. 
SPECTROSCOPE to fit six-inch equatorial. 
Very small SPECTROSCOPE. 
HELIOSCOPE. 
TELESCOPE OBJECTIVES. 
ACCURATE PLANE and PARALLEL SURFACES. 
No. 6-10 exhibited by J. A. Brashear, Allegheny, Pa. 
Microscope THEODOLITE, by Wannschaff of Berlin, made 
1895. 
LANTERN SLIDES from original negatives'of the following 
obiects : 
1. Eta Argus, from negatives made at the Cape of 
Good Hope Observatory by C. Ray Woods, under 
the direction of Dr. Gill. Exposure times vary 
from five minutes to twenty-five hours. For com- 
parison, Herschel’s drawing of 1834 will be shown. 
