b DICTIONARY OF ALTITUDES IN UNITED STATES. 



BAILEY, MAJ. G. E. 



An extfeii^irejist pf 'altitudes in California, compiled by Maj. G. E. 

 Biiloy, was* courteously furnished to this office. Most of the alti- 

 tudes compiled by him have been obtained from original sources, but 

 a considerable number remains credited to him as authority, because 

 the original authority has not been obtainable. 



BOUNDARY COMMISSION. 



The second survey of the boundary between the United States and 

 Mexico. The altitudes were determined by level and stadia. 



CHAMBERLAIN. 



Under this heading are included altitudes determined by a surve} 7 

 of the town lines of Massachusetts. These altitudes are trigo- 

 nometric. 



CITY ENGINEER AND CITY SURVEYOR. 



In cities where the different railroads occupy separate stations an 

 extensive correspondence has been had with the city engineers and 

 surveyors for the purpose of obtaining the relative heights of the 

 tracks at the various stations. In this way relative heights were 

 obtained in 550 cities and towns, including the principal railway 

 centers of the country. Incidentally, the elevations of city datum 

 points and other altitudes within the cities were obtained. 



EASTMAN. 



These results are from barometric work and from observations 

 upon the boiling point of water. 



EMORY, w. H. 



These consist of barometric determinations abstracted from a 

 Report of Explorations from Fort Leavenworth to San Diego, 1846. 

 (Thirtieth Congress, first session, Senate document.) 



FREMONT. 



These are barometric determinations compiled from reports of 

 the various expeditions of Fremont in the West. Owing to the 

 want of a barometric base they are, in general, of poor quality. 



GEOLOGICAL SURVEY OF NEW YORK (G. 8. OF N. Y.). 



These elevations are of barometric determination. 



GEOLOGICAL SURVEY OF VERMONT (G. S. OF VT.). 



All elevations credited to this authority are from barometric 

 determinations. 



