Yatwral 6 f/ >> Trenton ZAmeitone. 229 



very nearly sea level. At Marion, Indiana, in well No. 3, the 

 struck at 7 s feet below tide. In the Dwyer Well, 

 Sr. Henry's, Ohio, it was found 200 feet below tide; at Find- 

 lay, in the Pioneer Well, at 336 feet below; at the Godsend 

 Well, Wood County, at 395 feet below; at Dpper Sandusky, 

 in City Well, No. L, at 478 feet below; and in the Loomis 

 Well of Tiffin, at 747 feet below tide. The rock pressures, 

 therefore, of these Beveral wells should be found by multiply- 

 ing the number representing in feet the entire 1 length of the 

 water column by which the gas is compressed in each well by 

 47*> lbs. The lengths of the effective columns in the several 

 wells above named are' as follows: 600,678. 800, l .>'M\, 1078 

 and 1347 feet. The results of the calculations on the basis 

 above indicated, are shown in the following table, in wdiich 

 also other data as to the wells, including their first recorded 

 pressures are given. 





Location of wells. 



?r,?nVnn Relation of 



First 

 recorded 

 pr« ssure. 



280 to 

 290 lbs. 



Calcnlated pres- 

 sure on basis in- Remarks. 

 dicated above. 



1 



Muncie, Ind , 



950 ft. at sea-level 



286 lbs.= 



600 x -47 Gibs. 

 323 lbs.= 

 678 x -476 lbs. 



Figures as lo wells 

 are approximate. 





Marion, Ind.. 

 Well. No. 3, 



St. HeDry's, O., 

 Dwyer Well, 



870 ft. 78 ft. be'ow 



323 lbs. 







1156 ft. 200ft beTw 



375 lbs. 



381 lbs.= 

 800 x -476 lbs. 



Pressure first noted 



several montbs after 



completion of well. 



4 



Findlay. O., 

 Pioneer Well. 



1096 ft. 



336 ft. bel'w 



450 lbs. 



445 lbs.= 

 936 x 476 lbs. 



Pressure reported by 



driller, perhaps given 



in round numbers. 



5 



ZZLTvk "36ft.395f,be..w 



465 lbs. 



474 lbs.= 

 995 x -476 lbs. 



Pressure not noted at 

 opening of field. 



6 



Upper Sandusky. 

 City Well, No. 1, 



1278 ft. 478 ft. bel'w 



515 lbs. 

 600lbs.+ 



513 lbs.= 

 1078 x -476lbs 



641 lbs — 

 1347 x-476lbs 



Pressure reported by 

 gas trustees. 



7 



Tiffin, O.. 

 Loomis Well, 



1455 ft. 



747 ft. bel'w 



Gauge read only to 600 



lbs. : a considerable 

 excess indicated by it. 



The results shown in the preceding table are strictly repre- 

 sentative, and no facts from the new fields are known to the 

 writer that militate against the conclusion which these calcula- 

 tions oblige us to adopt, viz: that the rock pressure of the gas 

 of the Trenton limestone is due to the pressure of a water 

 column under which it is held in the arches of the rocks. 

 While this explanation of the rock pressure of gas is here 

 applied only to the new fields of Ohio and Indiana, it seems 

 probable that it is applicable to all gas fields. 



Columbus, Ohio. 



