ALTITUDES. 257 



the several county maps. Exceptions to this rule may occur. Our inten 

 tion is to have the names conform to those adopted upon our geological 

 map. The most important deviations from the usage of the county 

 maps have been explained in Chapter IX. 



The results of the numerous railroad and special surveys here ex 

 hibited, together make up a complete network of interlocking series of 

 accurately determined altitudes throughout the entire state. With this 

 as a basis of reference, it is believed that the barometrical measurements 

 of the altitudes of villages and of general sections will be found of the 

 highest value, in an inquiry into the geology, climate, and physical char 

 acter of New Hampshire. 



TABLES OF ALTITUDES, 

 i. PORTSMOUTH TO WHITE RIVER JUNCTION. 



Heights along- the Concord & Portsmouth Railroad. Levelled by 

 Frank and H. D. Woodbridge, in 1870, for the geological survey. Alti 

 tudes are given above mean tide in Great bay ; distances are given from 

 Portsmouth. 



Distances Heights in 



in miles. feet. 



Newmarket Junction, 10 51.916 



LittlefiekTs Crossing, 126.O53 



Epping, x8 154.147 



Raymond, . 23 197.881 



Candia, . 29 445. 19O 



Manchester, centre of depot, 41 18O.832 



Top of dam at Manchester, 178.98O 



Amoskeag base line, . . . . . . 108.980 



Surveys used in the Construction of the Road. From original profiles. 



Piscasset river (water level) , S. Newmarket, 72; track, . 77. 



Lamprey river (water level) , .... . . . 141. 



Same at Raymond, ........ 173 



Outlet of Jones pond (water level), ... . . 258. 



Road at Patten s shingle mill, Candia, . . . . . 373. 



Level of ground &quot; &quot; &quot; . . . . 354 



Brook east of Candia depot (water level) , . 4 1 



Cass s Crossing, Candia, 485 



Summit at Kinnecum s swamp, abandoned route, . . . 528. 



Turnpike at Rowe s Corner, &quot; 453 

 VOL. I. 35 



