Identification of the British Inch as the Unit of Measure. 159 



"Indeed, no exertion was sjjared to insure entire accuracy, 

 and compass, line and rule were alone relied u[)on in all matters 

 where an approximate estimate might lead to erroneous conclu- 

 sions." Introduction page 34. 



" These plans are all drawn from actual' and minute, and in 

 most instances personal survey, and are presented, unless other- 

 wise specially noted, on a uniform scale of .500 feet to the inch. 

 When there are interesting features, too minute to be satisfactorily 

 indicated on so small a scale enlarged plans have been adopted. 

 Sections and supi)lementary plans are given whenever it is sup- 

 posed they may illustrate the description or assist the compre- 

 hension of the reader. The greatest care has in all cases been 

 taken to secure perfect fidelity in all essential particulars." (Page 



10.) 



"To put all skepticism at rest, which might otherwise arise as 

 to the regularity of the works, it should be stated that they were all 

 carefully surveyed by the authors in person. Of course no diffi- 

 culty existed in determining the perfect regularity of the squares. 

 The method of procedure in respect to the circles was as follows : 

 Flags were raised at regular and convenient intervals upon the 

 embankments, representing stations. The compass was then 

 placed alternately at these stations, and the bearing of the next 

 flag ascertained. If the angles thus determined proved to be coin- 

 cident, the regularity of the work was placed beyond doubt." 



(Page 57)- 



"The square or rectangular works attending these large cir- 

 cles are of various dimensions. It has been observed, however, 

 that certain groups are marked by a great uniformity of size. Five 

 or six of these are noticed in the succeeding pages; they are ex- 

 act squares, each measuring 1080 feet to the side, a coincidence 

 which could not possibly be accidental, and which must possess 

 some significance. It certainly establishes the fact of some stand- 

 ard of measure among the ancient people, if not the possession of 

 some means of determining angles." (Page 48.) 



As to the plan of the Newark Works, in foot note to page 71 : 

 " A number of jjlans of these works, as well as of those at Marietta, 

 have been published; but they are all very defective, and fail to 

 convey an accurate conception of the group. The map here given 

 is from an original and very careful and minute survey made in 

 1836 by Charles Whittelsey, Esq., Topographical Engineer of the 

 State of Ohio, corrected and verified by careful re-surveys and 



