548 REPORTS OF AMERICAN OBSERVATORIES. 



III. Observations during the past year: 

 From September 1, 1878, to September 1, 1879. 



(c) Observations of the magnitudes and colors of double stars, 

 lunar peaks and craters, solar spots and faculee, belts of Jupiter, rings 

 of Saturn. In solar observations I find it advantageous generally to 

 reduce the aperature of my telescope to 3£- Q inches, and use an eyepiece 

 magnifying 80 diameters, with a right-angle prism instead of a colored 

 glass screen. 



(?') Measurements of position and distances of components of double 

 stars; heights of lunar peaks by the lengths of their shadows; width of 

 lunar craters; sizes of solar spots. 



IV. Work proposed for the coming year (1879-'S0): 

 A continuation of the above. 



Location of observatory: (City) near Fort Dodge; (County) Webster; 

 (State) Iowa. 



Longitude from Washington, l h . 8 m .5 west. 



Latitude, 42° 30' north. 

 Authority for latitude and longitude, F. Hess. 



I. Personnel: 

 Director, F. Hess. 

 Assistant, Mrs. P. B. Hess. 



II. Instruments: 



(a.) Aperture of objective, 2§ inches ; for observations of the sun, 

 aperture employed, 2| inches; magnifying power ordinarily employed, 

 50 diameters. 



(b) Meridian transit instruments : Makers, J. Brown & Son, New York ; 

 aperture, 1 inch ; magnifying power, lOi diameters, with horizontal and 

 vertical circle, each reading to 1. 



(g) Clocks : Mean time ; maker, G. M. Wheeler, Elgin, III. 



(i) Miscellaneous : One Troughton sextant and artificial horizon. 



III. Observations during the past year: 

 From September 15, 1878, to September 15, 1879. 



(a) Observations of sun-spots, occupations, eclipses of Jupiter's sat- 

 ellites, and searching for intra-Mercnrial planets. 



(b) (b') Observing the variations of the magnetic needle, altitudes and 

 azimuths, time, latitude and longitude, and approximately locating sun- 

 spots. 



(i) Observing altitudes, time, latitude and longitude of various places. 



IV. Work proposed for the coming year (1880): 

 Continuation of previous work and the establishment of an observa- 

 tory on Mount Zapato, Colorado, located 5.9 miles S. 76£ E. (M. B.) from 



