 He was in charge of the Baltimore station from June 5, 1900 to July 14, 1905; May 31, 1907 to April 2, 1909, and August 10, 1912 to April 14, 1919.While in Baltimore, he gave instruction in meteorology at the Johns Hopkins University and wrote "The Climate and Weather of Baltimore".He was in charge of the station at San Juan, Puerto Rico, from April 2, 1909 to August 10, 1912, and April 14, 1919 to June 10, 1930, where he had general charge of the West Indian and Caribbean service.