6 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 89 



the expedition. Unfortunately, cloudy weather prevailed during most 

 of our stay in Washington, so that it was impossible to test the instru- 

 ments properly, particularly the water-vapor instrument, before our 

 departure. 



The expedition sailed from New York on the American freighter 

 West Kebar on January 31, 193 1, bound directly for the port of 



.75 



.80 



LOG /^sc 

 .85 



.90 



.95 



8 13 18 23 28 



LOG PYRHELIOMETER SOLAR CALORIES 



Fig. 3. 



(Note. — This day was much better than the average as regards haze at 

 Fogo. Used this day because it was the only one on whicli both the Angstrom 

 pyrhehometer and the p/psc instrument were operating satisfactorily.) 



St. Vincent in the Cape Verde Islands. Upon arriving at St. Vincent 

 we learned that the small inter-island steamer was not due to sail 

 for at least two weeks, so we took passage on the little two-masted 

 sailing schooner Ernestina, bound for the island of Fogo. With fair 

 winds it would have been a 24-hour trip. However, a calm necessitated 

 our remaining aboard the craft an additional night, since landing 

 through the surf at San Filipe, the chief town and port of the island, 



