THOMAS. ] 



OHIO. 



479 



Tlie lengths of the sides, diameters, and diagonals, ascertained from 

 a carefully drawn plat of large scale, are as follows: 



From 11 to 2. 

 From 2 to 4 . . 

 From 4 to 12 . 

 From 12 to 11 



Ffi't. 

 908 

 883 

 910 

 868 



Feet. 



From 1 to 5 1, QOg 



From 3 to 10 1, 005 



From 4 to 11 l^ 250 



From 2 to 12 1 272 



The inner angles are as follows : 



AtBtation 1 163^ 24' 



At station 2 103 53 



At station 3 166 27 



At station 4 105 28 



At station 5 163'=' 32' 



At station 12 103 40 



At station 10 168 30 



At station 11 105 06 



It is apparent from these figures and from the plat (PI. xxxviii) that 

 this iuclosure is comparatively regular, the opijosite angles, with one 

 exception, differing less than half a degree and the exceptional one dif- 

 fering from its opposite l)ut '2 degrees. Nevertheless the regularity is 

 not such as would be expected from the nse of instruments. 



The diameter a.s given by Messrs. Squier and Davis is 950 feet, and the 

 ai-ea, according to their calculation, is 18 acres. According to the 

 resurvey the diameter in one direction (measuring to the intersections 

 of the middle lines of the walls) is 1,008 feet and in the other 1,005. 

 That Messrs. Squier and Davis are to be understood as counting to the 

 middle of the walls, is to be inferred from the fact that the diameter of 

 the circle was evidently measured in this way. Assuming they were 

 correct in reference to the circle, it follows of necessity that their meas- 

 urements of the octagon are erroneous, the diameter given being 50 feet 

 too short and the area 2.6 acres too small ; 20.6 acres being the true area. 



LIBKHTY lOWN.SHIP WORKS.' 



The smaller circle is not as nearly complete as shown in the plate. 

 Instead of contimiing around the head of the ravine and joining the 

 larger circle at the right of the entrance, it comes to a stop on the bank 

 of a ravine at a point 313 feet south of the point where it connects with 

 the larger circle at the north or left side of the entrance. No trace of 

 it can now be seen between these points. The entrance is still in the 



* Squier and Davis, PI. XX. 



