Scope and Contents Photochronograph and Its Application to Star Transits. Stormont & Jackson, Printers. Washinton, D.C., 1891.Suggestions Regarding the Application of the Photochronograph. Stormont & Jackson, Printers. Washinton, D.C., 1894.Photochronograph Applied to the Measure of Double Stars and Planets. Stormont & Jackson, Printers. Washinton, D.C., 1894.Sun-Spot Drawings Made at the Georgetown College Observatory in 1850, September 20-November 6 by...