March, 1919] Temperatures of Ten Thousand Smokes 



265 



No. 4. T. 235° C. 86, S 31 W. Mt. Cerberus, S 15 W. 



This was a brilliantly colored hole between Katmai Pass and Broken 

 Mountain. The hole was on the north side of a gully, about four feet up, 

 and was nearly two feet across, but became very small three or four feet in. 

 The deposits were yellow and red, and very attractive. The entire 

 gully was much visited in 1917 by Dr. Shipley. As at Fumarole 3, 

 we attempted to tap the fissure which ran almost parallel with the 

 surface, but were unable to break through the hard incrustation with 

 which the tube was surrounded. The temperature at the mouth was 

 235° C, and about six feet down, 215° C. Photographs 3008 (See page 

 264), 3705. 



Photograph by Jasper D. Sayre 



THE THROAT OF FUMAROLE 6. 



This irregular throat prevented us from getting a temperature very far below the 

 surface, because it was impossible to bend the end of the thermocouple which 

 was insulated with porcelain tubes. This picture shows the thermocouple in 

 the position where it registered 260° C. Some indications of the bright incrus- 

 tations are also shown. 



No. 5. T. 309° C. Baked Mountain, N 19 W. XI, S 60 W. Mt. 

 Cerberus, S 14 E. 

 This was a round hole about a foot in diameter in the fiat surface of 

 the mud flow north of Fumarole 4, and could be recognized by the fact 

 that the steam did not condense until ten feet above the ground. 

 The incrustations were light yellow and dark brown, and very hard. 

 The temperature at the surface was 309° C; six feet down, only 231° C. 

 Photographs 3706 (See page 257), 3707, 3708. 



No. 6. T. 264° C. Knife Peak, N 3 W. IX N 61 W. 



This acid fumarole lay in the gulch that is prominent as a notch on 

 the upper edge of the crater rim of Novarupta. It is about 200 yards 

 east of the edge of the crater. 



The deposits were a bright yellow and the 



