120 ANNUAL REPORT SMITHSONIAN INSTITUTION, 19 3 2 



weeks at a time on Mount Wilson, the ovens remained hot enough to 

 bake bread both day and night. All kinds of cooking except frying 

 and broiling are readily done with this solar cooker. The kitchen 

 where food is prepared remains cool, and the housewife has a 

 delightful view of the mountains as she steps out to place it in the 

 ovens. The apparatus is too costly to be anything but a luxury. 



The most successful solar power installation thus far made was 

 located near Cairo in Egypt, and was used to pump water from the 

 Nile for irrigation. A description of it is given in the Smithsonian 

 Report for 1915. The principle is the same as that just illustrated in 

 the solar cooker, but vacuum jackets were not introduced to enhance 

 the heatins:. 



