266 



REPORT UNITED STATES GEOLOGICAL SURVEY. 



The following tables give some of the intervals for the eruptions ob- 

 served : 



Wti 



tX'M 



M 



a ° 



a ° 



o . 



'a fco 



eginni 

 inning 

 ting. 



•3fe 



a S 





-s^s 



^2 3 



3 ° 













s-« 



Ph 



^ 



ph 



m. s. 



m. s. 



m*. s. 



5 00 



5 30 



3 00 



5 00 



6 00 



4 30 



4 30 



5 30 



3 00 



5 45 



6 00 



4 00 



5 00 



6 10 



3 20 



1^ 



S O SO 



25.5 



First eruption . . 

 Second eraption 

 Third eruption . 

 Fourth eruption 

 Fifth eruption.. 



First to second. 

 Second to third 

 Third to fourth 

 Fourth tolifth. 

 Fifth to sixth- . 



After the spouting is over it is usually a minute before the water 

 retires. 



As the tables show, the water begins to rise until the basin overflows. 

 The eruption begins with a few bubbles of steam followed by bulges 

 when the steam escapes with a sound like that of a liquid escaping from 

 the bung of a barrel. This is soon followed by the spurting, which is to 

 a height of G to 10 feet. When the water retires it appears to be 

 sucked in as water is from a basin with a small aperture. As we have 

 seen, the temperature increases from about 166° at the time when the 

 geyser is quiet to 185° when it is in action, after which it decreases. 

 Although the eruptions noted were few in number, the geyser appears 

 to be very regular. Isolated eruptions were afterwards seen, but were 

 found to correspond to those that have been given above in the tables. 



No. 14, Soap Kettle. — This spring was named in 1872. Professor 

 Bradley says (report for 1872, page 246) : 



Forty feet beyond (the bulging spring), the Soap Kettle keeps np a furious boiling 

 of colored water, more or less covered with foam, looking like dirty soap-suds. Its 

 basin is lined with a yellowish brown deposit. This has probably been a strong 

 spouter, but now erupts only at long intervals, if at all. 



In 1878 it was a circular basin of hard geyserite, measuring about 9 

 feet in diameter. The rim was about a foot in heiglit. The inside 

 sloped gradually to an irregular opening, measuring, approximately, 3 by 

 2 feet about 3 feet from the top. In this the water was constantly agi- 

 tated with a surface temperature of 197° F., which increased to 197t}o F. 

 at a depth of 5 feet. The water rises at intervals of about a minute, and 

 remains up from 15 to 30 seconds. 



Black Sulphur Geyser. — This name was given in 1872 to three vents 

 which are farther up the river, and appear to be constantly agitated. 

 They have temperatures of 172^ F., 180° F., and 186° F. 



The Twins were also named in 1872, but when we saw them they ap- 



