PEALE.] 



UPPER GEYSER BASIN GRAND GROUP. 



217 



"water poured over the rim of tbe bowl, a considerable portion flowing directly into the 

 moutb of tbe Grand Geyser, and apparently producing an imijortant effect upon tbe 

 action of tbe latter.* 



In tliis there are really two eruptions, separated by an interval of 5 

 minutes, instead of over 26, as in the eruption I observed. It began 8 

 minutes after the Grand began to act. The second eruption was pre- 

 ceded by an escape of steam, which corresponds with what I observed. 

 In the 1 hour and 23 minutes which he gives as the duration of the sec- 

 ond eruption I am of the opinion there were a number of eruptions, 

 judging from what I saw in 1878, and from the fact that Professor Corn- 

 stock says the agitation was variable. 



1875. — Captain Ludlow, in describing the eruption of the Grand wit- 

 nessed by him, says that the Turban and Steam Vent both were in action 

 with the Grand. 



1878. — The eruptions of the Grand having been noted from a distance, 

 the behavior of the Turban during its action could not be noted. 



The Turban was seen spouting at 3.59 p. m. on August 26, and at 

 9.15 a. m. and 6.48 p. m. on the 30th, and at 11.02 a. m. on the 31st by 

 jVIr. Richardson, but beyond the fact that it was spouting nothing was 

 noted. On our second visit to the Basin, while mapping and investi- 

 gating the springs of the Grand Group, I obtained the following notes 

 on the Turban. The temperature a little after 12 o'clock, while the 

 vsplashing was going on, was 195° F. The following notes of the eruptions 

 were obtained : 



Septemher 10. — 11,40 a. m., splashes and spurts to 5 or 6 feet. 11.45 

 a. m., action ceases. 12.10 p. m., spurting begins again, 5 or 6 feet. 

 2 p. m., the geyser is perfectly quiet. 2.1").15 p. m., the water begins to 

 bulge and overflows to Grand. 2.18 p. m., bubbling quietly. 2.19 a. m., 

 action ceases. 2.34.50 p. m., bulges again. 2.38.30 p. m., action ceases. 

 2.54 p. m., spouting. 2.57.30 p. m., action ceases. 3.12 p. m., spouting. 

 3.14.50 p. m., action ceases. 



The eruption of the Grand on September 10 did not occur until 

 10.15 p. m. During the spoutings of the Turban just noted the basin 

 of the Grand was fall, and the water in it was perfectly quiet. Whether 

 the splashings I have noted were periods of one eruption or distinct 

 eruptions I cannot say. The time devoted to the examination of this 

 geyser was too short to determine much. 



In the following table, for the sake of comparison, I bring together 

 all the eruptions of the Turban that I have recorded in the previous 

 pages, considering each period of spouting as an eruption. 



Date. 



No. 



Daration. 



Intervals. 



1 

 2 

 3 

 4 

 1 

 2 

 1 

 2 



3 

 4 

 5 

 G 



h. m. s. 

 3 00 

 15 



"6"3 oo' 



3 05 



1 25 00>^ 

 5 00 

 3 10 

 C 4 15 



3 40 



4 30 

 2 50 



m. s. 



4 30 

 26 45 





5 00 

 15 10 



(t) 



15 50 

 15 30 

 14 .^0 



Observer. 



August 20, 1872.. 



August 25, 1873.., 

 September 10, 1871 



A, C. Pealo. 



Do. 



Do. 



Do. 

 Prof. 'i'heo.B.Comstock. 



Do. 

 A. C. Peale. 



Do. 



Do. 



Do. 



Do. 



Do. 



* As I have indicated in another place, this probably includes several eruptions, 

 t Nos. 2 and 3 of 1878 are not consecutive. 



Reconnaissance of Northwestern Wyoming in 1873, 6i.q.., p. 253. 



