ALTITUDES. 255 



for our work as affording the easiest route. For the same reason it will 

 be seen that we have failed to present complete lists of heights along 

 some other railroads, while in a few cases no records whatever could be 

 obtained. 



Among the railroad lines which we are able to present are, — a survey- 

 between Exeter and Salisbury, Mass.; the recent surveys for the Nashua 

 & Rochester Railroad, with points on a survey from Windham, the junc- 

 tion of this road with the Manchester & Lawrence Railroad, to Lowell ; 

 various points along the Boston, Lowell & Nashua, Wilton, and Peter- 

 borough railroads, with additional surveys extended from the present 

 terminus at Greenfield to the Connecticut river near Charlestown, and a 

 few points on a survey for this road from Claremont village to White 

 River Junction; a series of heights determined by surveys between 

 Rochester and Concord; the Suncook Valley Railroad; points on the 

 Manchester & North Weare Railroad, and others determined by surveys 

 extended westward to Keene ; the very accurate surveys of the Concord 

 & Claremont Railroad, with the Hillsborough Branch ; and the Boston, 

 Concord & Montreal Railroad. These various surveys have been tabu- 

 larly arranged in the above order, exhibiting several accurately measured 

 transverse sections of the state, while, by the last, a longitudinal series is 

 furnished from Lake Winnipiseogee to Lancaster. Other altitudes have 

 been gathered from railroad surveys not here mentioned. In all cases 

 the name of the surveyor, or the source from which information has been 

 obtained, is given, with any explanation which could add to its practical 

 value. 



Miscellaneous Altitudes. 



Other accurately determined altitudes have been collected from 

 different sources. A considerable number of these, in the vicinity of 

 our cities, are from the surveys for water-works. Others are from sur- 

 veys for canals, or for manufacturing companies, by which heights along 

 the rivers have been obtained, with the amount and extent of many of 

 the most important falls. Where such information has not been attain- 

 able, the height of our largest rivers has been stated approximately. 

 These altitudes are not presented here in full, as they would to a large 

 extent require repetition in another chapter, treating of our water-power. 



