18 GEOMETRICAL EARTHWORKS OF OHIO. 
The diameters as ascertained from the plat (in all cases to the inter- 
sections) are as follows: 
rOMply tONOmeee ans eae coe fle see tan | POrOMuUsONdeee cnet c=... 1,219 feet. 
LOUUG iLO aoe eee dicloateet.. NHS LOM)fabOM eects =< == 1,202 feet. 
TOMO MLO Me meee tei aoa L70Smteet= i Eromengtoniescess ec ce -- = 1,720 feet. 
ROME Ci lOve nace mare eee (aSomteeta | HTOM galore see ee ee sce 1,487 feet. 
The widths of the gateways are as follows, the measurements being 
from base to base: 
That at a 46 feet; at b 23 feet; atc 47 feet; at d 26 feet; at e37 feet; 
at f 12 feet; at h 60 feet. 
The angles at the crossings of the diagonals and diameters at the 
center oare so nearly rigat angles as to be worthy of notice in this con- 
nection. Tor instance, the angles at crossing of the diagonals bf and dh 
differ but 10’ from true right angles ; while those at the crossing of the 
diameters ae and eg ditter but 2’. 
The inner angles at the intersection of the lines of the walls, that is 
to say the angles of the octagon, are as follows: 
Ninamecinesa tec) cea 155°:59: A cAttb te cee ee en 113° 59! 
iro tee ce eto ase ola! fad 1550.30) <\tit ieee ae eee ee 114° 42/ 
Pian OR sca. Ue tess 1530560 4] SA eee es eee 117° 12! 
ZA 1 epee aaa ape ee 1580835". MGW eee oe ee ere 115° 05/ 
The very slight differences in the courses of the opposite sides, which 
in a true figure should be parallel, should not be overlooked. 
That between ab and ef is 1° 51’; between be and fg is 1° 22’; be- 
tween cd and gh is 35’; between de and h 36 is 12’. 
THE SQUARE AT NEWARK. 
This is the smaller square inclosure on the east side of the Newark 
works, and in pl. xxv, Ancient Monuments, is directly east of the 
pond. It connects with the fair-ground circle (KH on the plate) by a 
broken line of parallels. According to Col. Whittlesey’s plat it varies 
considerably from a true square, being distinetly narrowed on one 
side, but, as will be seen from the notes of the resurvey, it must 
have been very nearly square. <As it is well-nigh obliterated it was 
found impossible to trace the lines throughout, hence only those parts 
are marked in the figure (see Pl. V) which were satisfactorily deter- 
mined; the untraced portions are represented by dotted lines. 
The following are the field-notes of the resurvey, which commenced 
pear the middle of the southeastern line of wall at 1, running thence 
to 2, and so.on around, following the walls to station 7, whence, as the - 
wall was visible no farther, the close was made by running directly 
to station 1. 
