Lesley.] 



16 



[March 6, 



ville field, as it may be found in better condition in the central and north- 

 ern parts of the field. Carnegie Bros, have begun drilling two or three 

 wells to test the Gordon sand a little north of the centre of the Gants 

 field, a mile from No. 10 (Sylvis well). 

 None of the Latrobe wells are piped to Johnstown. 



Grapeville. — Table of Minute Pressures at Various Dates. 



o 



1 

 2 

 3 

 4 

 5 

 6 

 7 

 8 

 9 



10 

 11 

 12 

 13 



Name. 



Klingensniilh 



Henry 



Moore 



Welker 



Brown 



Ferree 



Minsinger . . . 



Shutts 



Kipple 



Sylvis 



Truxel 



Byers 



Agnew 



1100 

 1133 

 1149 

 1144 

 1224 

 13L2 

 14G6 

 1468 

 1360 

 1357 

 1267 

 1350 

 1420 



O 



Feb. 13, '86 

 June, 1886 



Oct., 



May, 1887 

 Aug., 



Nov. 21, " 

 Feb. 13, '89 

 Nov. 30, '89 

 Jan. 13, '90 

 Feb. 20, '90 

 Oct., 1890 

 Jan., 1891 



65 



70 

 65 



65 



70 

 40 



75 

 60 



The steady decline in minute pressure from 386 lbs. on April 20, 1889, to 

 65 lbs. on February 2, 1891, predicts a speedy extinction of the use of 

 natural gas at the Cambria Works. 



Calculating the average rate per day of the observed decrease we find it 

 to be as follows : 



From April 29, 1889, 648 days, 331 lbs. 2 lbs. per day. 



From Dec. 16, 1889, 413 



From May 26, 1890, 252 



From Nov. 3, 1890, 91 



From Dec. 1, 1890, 63 



From Jan. 5, 1891, 28 

 I take this opportunity to suggest that we have in the decline of gas 

 pressure in all wells of all gas regions the most cogent of arguments 

 against the theory that gas pressure is produced by the hydrostatic pres- 

 sure of the locality. For, it is self-evident that the hydrostatic pressure 

 must remain always tbe same, and therefore cannot be the vis a tergo 

 of a variable oil or gas pressure ; otherwise this last should also remain 

 constant to the last drop of oil and the last cubic foot of gas coming from 

 the well. The gradual decline of gas pressure in every well and all 

 wells is proof positive that it represents the gradual exhaustion of an in- 

 herent force of self-expansion not dependent upon any hydraulic vis a 

 tergo. 



